Vaclav Petricek Ingemar J. Cox Hui Han Isaac G. Councill C. Lee Giles A Comparison of On-Line Computer Science Citation Databases. 438-449 2005 conf/ercimdl/2005 ECDL http://dx.doi.org/10.1007/11551362_39 db/conf/ercimdl/ecdl2005.html#PetricekCHCG05