[1] J. Aczel: Results on entropy equation. Bull. Acad. Polon. Sci. Sér. Sci. Math. 25 (1977), 12-17. MR 0437968

[2] L. L. Campbell: Characterization of Entropy in Arbitrary Probability Spaces. Preprint No. 1970-32, Queen's University, Kingston, Ontario 1970.

[3] D. G. Gallager: Information Theory and Reliable Communication. John Wiley and Sons, New York 1968, 523-524. Zbl 0198.52201

[4] A. Kamiński, J. Mikusiński: On the entropy equation. Bull. Acad. Polon. Sci. Sér. Sci. Math. 22 (1974), 319-323. MR 0340870

[5] S. Kullback: Information Theory and Statistics. John Wiley and Sons, New York 1959. MR 0103557 | Zbl 0088.10406

[6] P. L. Kannappan, P. N. Rathie: An application of a functional equation to information theory. Ann. Polon. Math. XXVI (1972). MR 0304909 | Zbl 0235.39001

[7] D. F. Kerridge (1961): Inaccuracy and inference. J. Roy. Statist. Soc. Ser. A 23 (1961), 184-194. MR 0123375

[8] P. N. Rathie, P. L. Kannappan: A directed divergence function of type $\beta$. Inform. and Control 20 (1972), 38-45. MR 0414234 | Zbl 0231.94015

[9] A. Rényi: On measures of entropy and information. Proc. Fourth Berkeley Symposium Math. Statist. and Probability 1 (1961), 547-561. MR 0132570

[10] B. D. Sharma, Ram Autar: Relative information functions and their type $(\alpha, \beta)$ generalizations. Metrika.27 (1974), 41-50. MR 0363704

[11] B. D. Sharma, R. S. Soni: A new generalized functional equation for inaccuracy and entropy of kind $\beta$. Funkcial. Ekvac. 17 (1974), 1-11. MR 0403808 | Zbl 0312.94009

[12] H. Theil: Economics and Information Theory. North-Holland, Amsterdam 1967.