1. Krishnaji, N. (1974). Characterizations of some discrete dis-tributions based on damage model. Sankhyā, Series A, 36, 204–213.
2. Mahfoud, M. (1977). Study of weighted distributions and sizebiased sampling. Ph.D. Thesis, The Pennsylvania State University.
3. Mosimann, J. E. (1970). Discrete distribution models arising in pollen counts. In Random Counts in Scientific Work, Vol. 3, G. P. Patil, ed. The Pennsylvania State University Press, University Park. Pages 1–30.
4. Patil, G. P. and Ratnaparkhi, M. V. (1977). Characterizations of certain distributions based on additive damage models involving Rao-Rubin condition and some of its variants. Sankhyā, Series B, 39, 65–75.
5. Rao, C. R. (1965). On discrete distributions arising out of methods of ascertainment. In Classical and Contagious Discrete Distributions, G. P. Patil, ed. Statistical Publishing Society, Calcutta. Pages 320–332.