International research cooperation in the Baltic region: a scientometric analysis
... between two documents, Jour. Amer. Soc. Inform. Sci., Vol. 24, p. 265—269.
41. Small, H. G. 1974, Multiple citation patterns in scientific literature: The circle and bill models, Inform. Storage and Retriev, Vol. 10, p. 393—402.
42. Pislyakov, V., Shukshina, E. 2012, Measuring Excellence in Russia: Highly Cited Papers, Leading Institutions, Patterns of National and International Collaboration, Proceedings of STI 2012 Montréal, 17th International Conference on Science and Technology Indicators....