Egghe L. (1987) Pratt's measure for some bibliometric distributions and its relation with the 80/20 rule. Journal of the American Society for Information Science, 38 (4), 288-297. Humphrey S. M. (1984) File maintenance of MeSH headings in MEDLINE. Journal of the American Society for Information Science, 35 (1), 34-44. Pravdic N. and Oluic-Vukovic C. (1986) Dual approach to multiple authorship in the study of collaboration/scientific output relationship. Scientometrics, 10 (5-6), 259-280. Sen B. K. (1997) Mega-authorship from a bibliometric point of view. Malaysian Journal of Library and Information Science, 2 (2), 9-18. Subramanyam K. (1983) Bibliometric studies of research collaboration: a review. Journal of Information Science, 6 (1), 33-38.