Singh, R. P., and J. D. Bhardwaj. “ON AXIOMATIC CHARACTERISATION OF GENERALIZED QUALITATIVE MEASURE OF VARIATION OF INFORMATION THROUGH GENERATING FUNCTION”. Tamkang Journal of Mathematics 21, no. 4 (December 1, 1990): 365–376. Accessed April 19, 2024. https://journals.math.tku.edu.tw/index.php/TKJM/article/view/4685.