On the birthday problem: Some generalizations and applications. Rathie, P.N.; Zörnig, P. — 2003 International Journal of Mathematics and Mathematical Sciences
Some results for generalised hypergeometric functions Olkha, G.S.; Rathie, P.N. — 1970 Portugaliae mathematica
Some Characterization Theorems for Generalized Measures of Uncertainty and Information. P.N. Rathie — 1973 Metrika