1. Gawrysiak, P., Ryżko, D.: Acquisition of scientific information from the Internet: The PASSIM Project Concept. In: Proc. of ICAART 2011, Rome (2011)
2. Web of Science,
http://thomsonreuters.com/products_services/science/science_products/a-z/web_of_science/
3. Scopus,
http://www.scopus.com/home.url
4. Google Scholar,
http://scholar.google.com
5. Etxebarria, G., Gomez-Uranga, M.: Use of Scopus and Google Scholar to measure social science production in four major Spanish universities. Scientometrics 82, 333–349 (2010)