Stop the war!Остановите войну!
for scientists:
default search action
Google
Google Scholar
Semantic Scholar
Internet Archive Scholar
CiteSeerX
ORCIDLudo Waltman
Person information
- affiliation: Leiden University, Centre for Science and Technology Studies (CWTS), The Netherlands
Refine list
refinements active!
zoomed in on ?? of ?? records
view refined list in
export refined list as
showing all ?? records
2020 – today
- 2022
[j62]Alexis-Michel Mugabushaka
, Nees Jan van Eck, Ludo Waltman:
Funding COVID-19 research: Insights from an exploratory analysis using open data infrastructures. Quant. Sci. Stud. 3(3): 560-582 (2022)- [j61]Ludo Waltman, Vincent Larivière:
The challenges of scientometric studies of predatory publishing. Quant. Sci. Stud. 3(3): 857-858 (2022) - [i57]Alexis-Michel Mugabushaka, Nees Jan van Eck, Ludo Waltman:
Funding Covid-19 research: Insights from an exploratory analysis using open data infrastructures. CoRR abs/2202.11639 (2022) - [i56]Juan Pablo Bascur, Suzan Verberne, Nees Jan van Eck, Ludo Waltman:
Academic information retrieval using citation clusters: In-depth evaluation based on systematic reviews. CoRR abs/2207.03299 (2022) - [i55]Vincent A. Traag, Ludo Waltman:
Causal foundations of bias, disparity and fairness. CoRR abs/2207.13665 (2022) - 2021
- [j60]Peter Sjögårde, Per Ahlgren, Ludo Waltman:
Algorithmic labeling in hierarchical classifications of publications: Evaluation of bibliographic fields and term weighting approaches. J. Assoc. Inf. Sci. Technol. 72(7): 853-869 (2021) - [j59]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) - [j58]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) - [j57]Ludo Waltman:
Understanding gender differences in science requires a diversity of perspectives, including controversial ones. Quant. Sci. Stud. 2(1): 224 (2021) - [i54]Hanjo D. Boekhout, Inge van der Weijden, Ludo Waltman:
Gender differences in scientific careers: A large-scale bibliometric analysis. CoRR abs/2106.12624 (2021) - [i53]Hui-Zhen Fu, Ludo Waltman:
A large-scale bibliometric analysis of global climate change research between 2001 and 2018. CoRR abs/2107.08214 (2021) - [i52]Wout S. Lamers, Kevin W. Boyack, Vincent Larivière, Cassidy R. Sugimoto, Nees Jan van Eck, Ludo Waltman, Dakota S. Murray:
Measuring Disagreement in Science. CoRR abs/2107.14641 (2021) - 2020
- [j56]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) - [j55]Ludo Waltman, Vincent Larivière:
Special issue on bibliographic data sources. Quant. Sci. Stud. 1(1): 360-362 (2020) - [j54]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
- [j53]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) - [j52]Nees Jan van Eck, Ludo Waltman:
Analyzing the activities of visitors of the Leiden Ranking website. J. Data Inf. Sci. 3(3): 81-98 (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]