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2. Citation indexing. Its theory and application in science, technology and humanities;Garfield,1979
3. World flash on basic research – The newest version of the facts and figures on publication output and relative citation impact of 100 countries 1981–1985;Braun;Scientometrics,1988
4. Measuring Science;Van Raan,2004
5. Citation analysis in research evaluation;Moed,2005