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ORCIDLudo Waltman
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- affiliation: Leiden University, Centre for Science and Technology Studies (CWTS), The Netherlands
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2020 – today
- 2021
[j58]Martijn S. Visser
, Nees Jan van Eck, Ludo Waltman:
Large-scale comparison of bibliographic data sources: Scopus, Web of Science, Dimensions, Crossref, and Microsoft Academic. Quant. Sci. Stud. 2(1): 20-41 (2021)- [j57]Yi Bu, Ludo Waltman, Yong Huang:
A multidimensional framework for characterizing the citation impact of scientific publications. Quant. Sci. Stud. 2(1): 155-183 (2021) - [j56]Ludo Waltman:
Understanding gender differences in science requires a diversity of perspectives, including controversial ones. Quant. Sci. Stud. 2(1): 224 (2021) - 2020
- [j55]Ludo Waltman, Vincent Larivière, Stasa Milojevic, Cassidy R. Sugimoto:
Opening science: The rebirth of a scholarly journal. Quant. Sci. Stud. 1(1): 1-3 (2020) - [j54]Ludo Waltman, Vincent Larivière:
Special issue on bibliographic data sources. Quant. Sci. Stud. 1(1): 360-362 (2020) - [j53]Ludo Waltman, Kevin W. Boyack, Giovanni Colavizza, Nees Jan van Eck:
A principled methodology for comparing relatedness measures for clustering publications. Quant. Sci. Stud. 1(2): 691-713 (2020) - [c22]Juan Pablo Bascur, Suzan Verberne, Nees Jan van Eck, Ludo Waltman:
Browsing Citation Clusters for Academic Literature Search: A Simulation Study with Systematic Reviews. BIR@ECIR 2020: 53-65 - [i51]Peter Sjögårde, Per Ahlgren, Ludo Waltman:
Algorithmic labeling in hierarchical classifications of publications: Evaluation of bibliographic fields and term weighting approaches. CoRR abs/2004.08090 (2020) - [i50]Martijn S. Visser, Nees Jan van Eck, Ludo Waltman:
Large-scale comparison of bibliographic data sources: Scopus, Web of Science, Dimensions, Crossref, and Microsoft Academic. CoRR abs/2005.10732 (2020)
2010 – 2019
- 2019
- [c21]Juan Pablo Bascur, Nees Jan van Eck, Ludo Waltman:
An Interactive Visual Tool for Scientific Literature Search: Proposal and Algorithmic Specification. BIR@ECIR 2019: 76-87 - [c20]Yi Bu, Ludo Waltman, Yong Huang:
A multidimensional perspective on the citation impact of scientific publications. ISSI 2019: 561-572 - [c19]Lovro Subelj, Ludo Waltman, Vincent A. Traag, Nees Jan van Eck:
Intermediacy of publications. ISSI 2019: 1288-1300 - [c18]Giovanni Colavizza, Massimo Franceschet, Vincent A. Traag, Ludo Waltman:
Quantifying the long-term influence of scientific publications. ISSI 2019: 1301-1306 - [c17]Vincent A. Traag, Ludo Waltman:
Persistence of journal hierarchy in open access publishing. ISSI 2019: 1339-1345 - [c16]Wout S. Lamers, Nees Jan van Eck, Ludo Waltman:
Variations in citation practices across the scientific landscape: Analysis based on a large full-text corpus. ISSI 2019: 2121-2132 - [c15]Martijn S. Visser, Nees Jan van Eck, Ludo Waltman:
Large-scale comparison of bibliographic data sources: Web of Science, Scopus, Dimensions, and Crossref. ISSI 2019: 2358-2369 - [c14]Dakota S. Murray, Wout Lamers, Kevin W. Boyack, Vincent Larivière, Cassidy R. Sugimoto, Nees Jan van Eck, Ludo Waltman:
Measuring disagreement in science. ISSI 2019: 2370-2375 - [p1]Ludo Waltman, Nees Jan van Eck:
Field Normalization of Scientometric Indicators. Springer Handbook of Science and Technology Indicators 2019: 281-300 - [i49]Ludo Waltman, Kevin W. Boyack, Giovanni Colavizza, Nees Jan van Eck:
A principled methodology for comparing relatedness measures for clustering publications. CoRR abs/1901.06815 (2019) - [i48]Yi Bu, Ludo Waltman, Yong Huang:
A multidimensional perspective on the citation impact of scientific publications. CoRR abs/1901.09663 (2019) - [i47]Nees Jan van Eck, Ludo Waltman:
Accuracy of citation data in Web of Science and Scopus. CoRR abs/1906.07011 (2019) - 2018
- [j52]Giovanni Colavizza, Kevin W. Boyack, Nees Jan van Eck, Ludo Waltman:
The Closer the Better: Similarity of Publication Pairs at Different Cocitation Levels. J. Assoc. Inf. Sci. Technol. 69(4): 600-609 (2018) - [j51]Kevin W. Boyack, Nees Jan van Eck, Giovanni Colavizza, Ludo Waltman:
Characterizing in-text citations in scientific articles: A large-scale analysis. J. Informetrics 12(1): 59-73 (2018) - [i46]Ludo Waltman, Nees Jan van Eck:
Field normalization of scientometric indicators. CoRR abs/1801.09985 (2018) - [i45]Nees Jan van Eck, Ludo Waltman:
Analyzing the activities of visitors of the Leiden Ranking website. CoRR abs/1804.03869 (2018) - [i44]Ludo Waltman, Sybille Hinze, Andrea Scharnhorst, Jesper Wiborg Schneider, Theresa Velden:
Exploration of reproducibility issues in scientometric research Part 1: Direct reproducibility. CoRR abs/1804.05024 (2018) - [i43]Theresa Velden, Sybille Hinze, Andrea Scharnhorst, Jesper Wiborg Schneider, Ludo Waltman:
Exploration of Reproducibility Issues in Scientometric Research Part 2: Conceptual Reproducibility. CoRR abs/1804.05026 (2018) - [i42]Vincent A. Traag, Ludo Waltman:
Systematic analysis of agreement between metrics and peer review in the UK REF. CoRR abs/1808.03491 (2018) - [i41]Vincent A. Traag, Ludo Waltman, Nees Jan van Eck:
From Louvain to Leiden: guaranteeing well-connected communities. CoRR abs/1810.08473 (2018) - [i40]Lovro Subelj, Ludo Waltman, Vincent A. Traag, Nees Jan van Eck:
Intermediacy of publications. CoRR abs/1812.08259 (2018) - 2017
- [j50]Ludo Waltman:
Special section on performance-based research funding systems. J. Informetrics 11(3): 904 (2017) - [j49]Nees Jan van Eck, Ludo Waltman:
Citation-based clustering of publications using CitNetExplorer and VOSviewer. Scientometrics 111(2): 1053-1070 (2017) - [j48]Kevin W. Boyack, Wolfgang Glänzel, Jochen Gläser, Frank Havemann, Andrea Scharnhorst, Bart Thijs, Nees Jan van Eck, Theresa Velden, Ludo Waltman:
Topic identification challenge. Scientometrics 111(2): 1223-1224 (2017) - [c13]Giovanni Colavizza, Kevin W. Boyack, Nees Jan van Eck, Ludo Waltman:
Exploring the Similarity of Articles Co-cited at Different Levels. ISSI 2017: 549-560 - [c12]Ludo Waltman, Kevin W. Boyack, Giovanni Colavizza, Nees Jan van Eck:
A principled methodology for comparing relatedness measures for clustering publications. ISSI 2017: 691-702 - [c11]Kevin W. Boyack, Nees Jan van Eck, Giovanni Colavizza, Ludo Waltman:
Reference behavior in the full text of scientific articles: A large-scale analysis. ISSI 2017: 787-798 - [c10]Nees Jan van Eck, Ludo Waltman:
Accuracy of citation data in Web of Science and Scopus. ISSI 2017: 1087-1092 - [c9]Nees Jan van Eck, Ludo Waltman, Min Song, Yoo Kyung Jeong:
Using full-text data to create improved term maps. ISSI 2017: 1136-1141 - [i39]Nees Jan van Eck, Ludo Waltman:
Citation-based clustering of publications using CitNetExplorer and VOSviewer. CoRR abs/1702.03411 (2017) - [i38]Ludo Waltman, Vincent A. Traag:
Use of the journal impact factor for assessing individual articles need not be wrong. CoRR abs/1703.02334 (2017) - [i37]Giovanni Colavizza, Kevin W. Boyack, Nees Jan van Eck, Ludo Waltman:
The Closer the Better: Similarity of Publication Pairs at Different Co-Citation Levels. CoRR abs/1707.03076 (2017) - [i36]Kevin W. Boyack, Nees Jan van Eck, Giovanni Colavizza, Ludo Waltman:
Characterizing in-text citations in scientific articles: A large-scale analysis. CoRR abs/1710.03094 (2017) - 2016
- [j47]Qi Wang, Ludo Waltman:
Large-scale analysis of the accuracy of the journal classification systems of Web of Science and Scopus. J. Informetrics 10(2): 347-364 (2016) - [j46]Ludo Waltman:
A review of the literature on citation impact indicators. J. Informetrics 10(2): 365-391 (2016) - [j45]Ludo Waltman:
Special section on size-independent indicators in citation analysis. J. Informetrics 10(2): 645 (2016) - [j44]Ludo Waltman, Nees Jan van Eck, Martijn S. Visser, Paul Wouters:
The elephant in the room: The problem of quantifying productivity in evaluative scientometrics. J. Informetrics 10(2): 671-674 (2016) - [j43]Antonio Perianes-Rodríguez, Ludo Waltman, Nees Jan van Eck:
Constructing bibliometric networks: A comparison between full and fractional counting. J. Informetrics 10(4): 1178-1195 (2016) - [j42]Ludo Waltman:
Special section on statistical inference in citation analysis. J. Informetrics 10(4): 1224 (2016) - [j41]Ludo Waltman:
Conceptual difficulties in the use of statistical inference in citation analysis. J. Informetrics 10(4): 1249-1252 (2016) - [i35]Ludo Waltman, Nees Jan van Eck, Martijn S. Visser, Paul Wouters:
The elephant in the room: The problem of quantifying productivity in evaluative scientometrics. CoRR abs/1605.02378 (2016) - [i34]Antonio Perianes-Rodríguez, Ludo Waltman, Nees Jan van Eck:
Constructing bibliometric networks: A comparison between full and fractional counting. CoRR abs/1607.02452 (2016) - [i33]Ludo Waltman:
Conceptual difficulties in the use of statistical inference in citation analysis. CoRR abs/1612.03285 (2016) - 2015
- [j40]Javier Ruiz-Castillo, Ludo Waltman:
Field-normalized citation impact indicators using algorithmically constructed classification systems of science. J. Informetrics 9(1): 102-117 (2015) - [j39]Ludo Waltman:
Message from the new Editor-in-Chief. J. Informetrics 9(1): A3-A6 (2015) - [j38]Clara Stegehuis, Nelly Litvak, Ludo Waltman:
Predicting the long-term citation impact of recent publications. J. Informetrics 9(3): 642-657 (2015) - [j37]Ludo Waltman, Nees Jan van Eck:
Field-normalized citation impact indicators and the choice of an appropriate counting method. J. Informetrics 9(4): 872-894 (2015) - [c8]Ludo Waltman, Nees Jan van Eck:
Field-Normalized Citation Impact Indicators and the Choice of an Appropriate Counting Method. ISSI 2015 - [i32]Ludo Waltman, Nees Jan van Eck:
Field-normalized citation impact indicators and the choice of an appropriate counting method. CoRR abs/1501.04431 (2015) - [i31]Clara Stegehuis, Nelly Litvak, Ludo Waltman:
Predicting the long-term citation impact of recent publications. CoRR abs/1503.09156 (2015) - [i30]Ludo Waltman:
A review of the literature on citation impact indicators. CoRR abs/1507.02099 (2015) - [i29]Qi Wang, Ludo Waltman:
Large-Scale Analysis of the Accuracy of the Journal Classification Systems of Web of Science and Scopus. CoRR abs/1511.00735 (2015) - [i28]Lovro Subelj, Nees Jan van Eck, Ludo Waltman:
Clustering scientific publications based on citation relations: A systematic comparison of different methods. CoRR abs/1512.09023 (2015) - 2014
- [j36]Ludo Waltman, Rodrigo Costas:
F1000 Recommendations as a Potential New Data Source for Research Evaluation: A Comparison With Citations. J. Assoc. Inf. Sci. Technol. 65(3): 433-445 (2014) - [j35]Nees Jan van Eck, Ludo Waltman:
CitNetExplorer: A new software tool for analyzing and visualizing citation networks. J. Informetrics 8(4): 802-823 (2014) - [j34]Per Ahlgren, Ludo Waltman:
The correlation between citation-based and expert-based assessments of publication channels: SNIP and SJR vs. Norwegian quality assessments. J. Informetrics 8(4): 985-996 (2014) - [c7]Nees Jan van Eck, Ludo Waltman:
Systematic Retrieval of Scientific Literature based on Citation Relations: Introducing the CitNetExplorer Tool. BIR@ECIR 2014: 13-20 - [i27]Nees Jan van Eck, Ludo Waltman:
CitNetExplorer: A new software tool for analyzing and visualizing citation networks. CoRR abs/1404.5322 (2014) - [i26]Ludo Waltman, Anthony F. J. van Raan, Sue Smart:
Exploring the relationship between the Engineering and Physical Sciences and the Health and Life Sciences by advanced bibliometric methods. CoRR abs/1407.0199 (2014) - 2013
- [j33]Ludo Waltman, Michael Schreiber:
On the calculation of percentile-based bibliometric indicators. J. Assoc. Inf. Sci. Technol. 64(2): 372-379 (2013) - [j32]Ludo Waltman, Nees Jan van Eck, Thed N. van Leeuwen, Martijn S. Visser:
Some modifications to the SNIP journal impact indicator. J. Informetrics 7(2): 272-285 (2013) - [j31]Ludo Waltman, Nees Jan van Eck, Paul Wouters:
Counting publications and citations: Is more always better? J. Informetrics 7(3): 635-641 (2013) - [j30]Ludo Waltman, Nees Jan van Eck:
A systematic empirical comparison of different approaches for normalizing citation impact indicators. J. Informetrics 7(4): 833-849 (2013) - [j29]Ludo Waltman, Nees Jan van Eck:
Source normalized indicators of citation impact: an overview of different approaches and an empirical comparison. Scientometrics 96(3): 699-716 (2013) - [i25]Ludo Waltman, Nees Jan van Eck, Paul Wouters:
Counting publications and citations: Is more always better? CoRR abs/1301.4597 (2013) - [i24]Ludo Waltman, Nees Jan van Eck:
A systematic empirical comparison of different approaches for normalizing citation impact indicators. CoRR abs/1301.4941 (2013) - [i23]Ludo Waltman, Rodrigo Costas:
F1000 recommendations as a new data source for research evaluation: A comparison with citations. CoRR abs/1303.3875 (2013) - [i22]Ludo Waltman, Nees Jan van Eck:
A smart local moving algorithm for large-scale modularity-based community detection. CoRR abs/1308.6604 (2013) - 2012
- [j28]Ludo Waltman, Nees Jan van Eck, Anthony F. J. van Raan:
Universality of citation distributions revisited. J. Assoc. Inf. Sci. Technol. 63(1): 72-77 (2012) - [j27]Ludo Waltman, Nees Jan van Eck:
The inconsistency of the h-index. J. Assoc. Inf. Sci. Technol. 63(2): 406-415 (2012) - [j26]Ludo Waltman, Nees Jan van Eck:
A new methodology for constructing a publication-level classification system of science. J. Assoc. Inf. Sci. Technol. 63(12): 2378-2392 (2012) - [j25]Ludo Waltman, Clara Calero-Medina, Joost Kosten, Ed C. M. Noyons, Robert J. W. Tijssen, Nees Jan van Eck, Thed N. van Leeuwen, Anthony F. J. van Raan, Martijn S. Visser, Paul Wouters:
The Leiden ranking 2011/2012: Data collection, indicators, and interpretation. J. Assoc. Inf. Sci. Technol. 63(12): 2419-2432 (2012) - [j24]Ludo Waltman:
An empirical analysis of the use of alphabetical authorship in scientific publishing. J. Informetrics 6(4): 700-711 (2012) - [j23]Ludo Waltman, Nees Jan van Eck:
A mathematical analysis of the long-run behavior of genetic algorithms for social modeling. Soft Comput. 16(6): 1071-1089 (2012) - [i21]Ludo Waltman, Clara Calero-Medina, Joost Kosten, Ed C. M. Noyons, Robert J. W. Tijssen, Nees Jan van Eck, Thed N. van Leeuwen, Anthony F. J. van Raan, Martijn S. Visser, Paul Wouters:
The Leiden Ranking 2011/2012: Data collection, indicators, and interpretation. CoRR abs/1202.3941 (2012) - [i20]Ludo Waltman, Nees Jan van Eck:
A new methodology for constructing a publication-level classification system of science. CoRR abs/1203.0532 (2012) - [i19]Robert J. W. Tijssen, Ludo Waltman, Nees Jan van Eck:
Research collaboration and the expanding science grid: Measuring globalization processes worldwide. CoRR abs/1203.4194 (2012) - [i18]Ludo Waltman, Michael Schreiber:
On the calculation of percentile-based bibliometric indicators. CoRR abs/1205.0646 (2012) - [i17]Ludo Waltman:
An empirical analysis of the use of alphabetical authorship in scientific publishing. CoRR abs/1206.4863 (2012) - [i16]Ludo Waltman, Nees Jan van Eck:
Source normalized indicators of citation impact: An overview of different approaches and an empirical comparison. CoRR abs/1208.6122 (2012) - [i15]Ludo Waltman, Nees Jan van Eck, Thed N. van Leeuwen, Martijn S. Visser:
Some modifications to the SNIP journal impact indicator. CoRR abs/1209.0785 (2012) - [i14]Nees Jan van Eck, Ludo Waltman, Anthony F. J. van Raan, Robert J. M. Klautz, Wilco C. Peul:
Citation analysis may severely underestimate the impact of clinical research as compared to basic research. CoRR abs/1210.0442 (2012) - 2011
- [j22]Leo Egghe, Ludo Waltman:
Relations between the shape of a size-frequency distribution and the shape of a rank-frequency distribution. Inf. Process. Manag. 47(2): 238-245 (2011) - [j21]Ludo Waltman, Nees Jan van Eck, Thed N. van Leeuwen, Martijn S. Visser, Anthony F. J. van Raan:
Towards a new crown indicator: Some theoretical considerations. J. Informetrics 5(1): 37-47 (2011) - [j20]Lutz Bornmann, Ludo Waltman:
The detection of "hot regions" in the geography of science - A visualization approach by using density maps. J. Informetrics 5(4): 547-553 (2011) - [j19]Ludo Waltman, Robert J. W. Tijssen, Nees Jan van Eck:
Globalisation of science in kilometres. J. Informetrics 5(4): 574-582 (2011) - [j18]Ludo Waltman, Nees Jan van Eck, Thed N. van Leeuwen, Martijn S. Visser, Anthony F. J. van Raan:
Towards a new crown indicator: an empirical analysis. Scientometrics 87(3): 467-481 (2011) - [j17]Ludo Waltman, Nees Jan van Eck, Thed N. van Leeuwen, Martijn S. Visser, Anthony F. J. van Raan:
On the correlation between bibliometric indicators and peer review: reply to Opthof and Leydesdorff. Scientometrics 88(3): 1017-1022 (2011) - [j16]Ludo Waltman, Erjia Yan, Nees Jan van Eck:
A recursive field-normalized bibliometric performance indicator: an application to the field of library and information science. Scientometrics 89(1): 301-314 (2011) - [i13]Lutz Bornmann, Ludo Waltman:
The detection of "hot regions" in the geography of science: A visualization approach by using density maps. CoRR abs/1102.3862 (2011) - [i12]Ludo Waltman, Robert J. W. Tijssen, Nees Jan van Eck:
Globalisation of science in kilometres. CoRR abs/1103.3648 (2011) - [i11]Ludo Waltman, Nees Jan van Eck, Anthony F. J. van Raan:
Universality of citation distributions revisited. CoRR abs/1105.2934 (2011) - [i10]Ludo Waltman, Erjia Yan, Nees Jan van Eck:
A recursive field-normalized bibliometric performance indicator: An application to the field of library and information science. CoRR abs/1105.3212 (2011) - [i9]Ludo Waltman, Nees Jan van Eck, Thed N. van Leeuwen, Martijn S. Visser, Anthony F. J. van Raan:
On the correlation between bibliometric indicators and peer review: Reply to Opthof and Leydesdorff. CoRR abs/1105.5316 (2011) - [i8]Ludo Waltman, Nees Jan van Eck:
The inconsistency of the h-index. CoRR abs/1108.3901 (2011) - [i7]Nees Jan van Eck, Ludo Waltman:
Text mining and visualization using VOSviewer. CoRR abs/1109.2058 (2011) - 2010
- [j15]Ludo Waltman, Nees Jan van Eck:
The relation between Eigenfactor, audience factor, and influence weight. J. Assoc. Inf. Sci. Technol. 61(7): 1476-1486 (2010) - [j14]Nees Jan van Eck, Ludo Waltman, Rommert Dekker, Jan van den Berg:
A comparison of two techniques for bibliometric mapping: Multidimensional scaling and VOS. J. Assoc. Inf. Sci. Technol. 61(12): 2405-2416 (2010) - [j13]Anthony F. J. van Raan, Thed N. van Leeuwen, Martijn S. Visser, Nees Jan van Eck, Ludo Waltman:
Rivals for the crown: Reply to Opthof and Leydesdorff. J. Informetrics 4(3): 431-435 (2010) - [j12]Ludo Waltman, Nees Jan van Eck, Ed C. M. Noyons:
A unified approach to mapping and clustering of bibliometric networks. J. Informetrics 4(4): 629-635 (2010) - [j11]Nees Jan van Eck, Ludo Waltman, Ed C. M. Noyons, R. K. Buter:
Automatic term identification for bibliometric mapping. Scientometrics 82(3): 581-596 (2010) - [j10]Nees Jan van Eck, Ludo Waltman:
Software survey: VOSviewer, a computer program for bibliometric mapping. Scientometrics 84(2): 523-538 (2010) - [i6]Anthony F. J. van Raan, Thed N. van Leeuwen, Martijn S. Visser, Nees Jan van Eck, Ludo Waltman:
Rivals for the crown: Reply to Opthof and Leydesdorff. CoRR abs/1003.2113 (2010) - [i5]Ludo Waltman, Nees Jan van Eck, Thed N. van Leeuwen, Martijn S. Visser, Anthony F. J. van Raan:
Towards a new crown indicator: Some theoretical considerations. CoRR abs/1003.2167 (2010) - [i4]Ludo Waltman, Nees Jan van Eck:
The relation between Eigenfactor, audience factor, and influence weight. CoRR abs/1003.2198 (2010) - [i3]Nees Jan van Eck, Ludo Waltman, Rommert Dekker, Jan van den Berg:
A comparison of two techniques for bibliometric mapping: Multidimensional scaling and VOS. CoRR abs/1003.2551 (2010) - [i2]Ludo Waltman, Nees Jan van Eck, Thed N. van Leeuwen, Martijn S. Visser, Anthony F. J. van Raan:
Towards a new crown indicator: An empirical analysis. CoRR abs/1004.1632 (2010) - [i1]Ludo Waltman, Nees Jan van Eck, Ed C. M. Noyons:
A unified approach to mapping and clustering of bibliometric networks. CoRR abs/1006.1032 (2010)
2000 – 2009
- 2009
- [j9]Nees Jan van Eck, Ludo Waltman:
How to normalize cooccurrence data? An analysis of some well-known similarity measures. J. Assoc. Inf. Sci. Technol. 60(8): 1635-1651 (2009) - [j8]Ludo Waltman, Nees Jan van Eck:
Some comments on Egghe's derivation of the impact factor distribution. J. Informetrics 3(4): 363-366 (2009) - [j7]Nees Jan van Eck, Ludo Waltman:
On the proper understanding of the limiting behavior of generalizations of the h- and g-indices. J. Informetrics 3(4): 369-370 (2009) - 2008
- [j6]Nees Jan van Eck, Ludo Waltman:
Appropriate similarity measures for author co-citation analysis. J. Assoc. Inf. Sci. Technol. 59(10): 1653-1661 (2008) - [j5]Nees Jan van Eck, Ludo Waltman:
Generalizing the h- and g-indices. J. Informetrics 2(4): 263-271 (2008) - [j4]Ludo Waltman, Nees Jan van Eck:
Some comments on the journal weighted impact factor proposed by Habibzadeh and Yadollahie. J. Informetrics 2(4): 369-372 (2008) - 2007
- [j3]Nees Jan van Eck, Ludo Waltman:
Bibliometric Mapping of the Computational Intelligence Field. Int. J. Uncertain. Fuzziness Knowl. Based Syst. 15(5): 625-645 (2007) - [j2]Ludo Waltman, Nees Jan van Eck:
Some comments on the question whether co-occurrence data should be normalized. J. Assoc. Inf. Sci. Technol. 58(11): 1701-1703 (2007) - 2006
- [j1]