COLE S., Age and scientific performance. Am. J. Sociol. 84; 1979; 958-977. GUPTA D. K., Author productivity and areas of research interest; a case study of Nigerian entomologists. Ann. Lib. Sci. Doc. 32, 1-2; 1985; 56-62. KALYANE V. L. and KALYANE S. V., Scientometric dimensions of innovation communication productivity system. Ann. Lib. Sci. Doc. 38, 1; 1991; 8-29. KALYANE V. L., Scientometric Portait of L. L. Narayana, Chapter VII: 3, In: Knowledge Societies and Libraries, 2004. Eds. N. Laxman Rao, S. Sudarshan Rao and T. V. Prafulla Chandra. p.p.. 362-388. Ess Ess Publications, New Delhi, India, ISBN: 81-7000-353-9 KALYANE V. L. and KALYANE S. V., Scientometric Portrait of M.S. Swaminathan. Library Science with a slant to Documentation and Information Studies. 31; 1994; 31-45. KALYANE V. L. and SAMANTA R.K., Informetrics on K. Ramiah, Chapter 47, In : New Vistas In Library and Information Science. Eds. A. A. N. Raju, L. S. Ramaiah, N. Laxman Rao and T. V. Prafull Chandra Papers in honour of Prof. G. V. S. L. Narasimha Raju. 1995. Vikas Publish in House Pvt. Ltd.; New Delhi, p.p. 565- 578. ISBN: 0-7069-9126-5 KALYANE V. L. and DEVARAI R. S., Informetrics on C.S. Venkata Ram, Chapter 43, In : New Horizons in Library and Information Science Dr. Velaga Venkatappaiah Festschrift. Eds. C. P. Vashisth, L. S. Ramiah, N. V. Jaggarao, and T. V. Prafulla Chandra, ISBN: 81-85427-54-2, 1994; T.R. Publications. Madras; p.p. 475-478. OVER R., Does research productivity decline with age? Higher Education. 11: 1982; 511. VINKLER P., Bibliometric analysis of publication activity of a scientific research institute. In: Informetrics 89/90. Eds. Egghe L and Rousseau R., 1990. Elsevier Science Publishers, B. V; 309-334. ZUCKERMAN H., Scientific Elite. 1997. Free Press; New York.