[1] J. Aczél:
Results on entropy equation. Bull. Acad. Polon. Sci. Ser. Sci. Math. 25 (1977), 13-17.
MR 0437968
[2] W. Eichhorn:
Functional Equations in Economies. Addison Wesley Publishing Company, Reading, Massachusetts 1978.
MR 0512895
[3] D. K. Faddeev:
On the concept of entropy of a finite probabilistic scheme. (in Russian). Uspekhi Mat. Nauk 11(1) (1966), 227-231.
MR 0077814
[4] J. Havrda, F. Charvát:
Quantification method of classification processes: the concept of structural a-entropy. Kybernetika 3 (1967), 30-35.
MR 0209067
[5] A. Kamiński, Mikusiński:
On the entropy equation. Bull. Acad. Polon. Sci. Ser. Sci. Math. 22 (1974), 319-323.
MR 0340870
[6] B. D. Sharma, Ishwar Singh:
On entropy function of degree $\beta$. Inform. Sci. 19 (1980) (refer to Ph. D. thesis of Ishwar Singh, University of Ujjain, 1980).
MR 0538396
[7] B. D. Sharma, Ishwar Singh:
On entropy function of degree $(\alpha, \beta)$. 1980 (unpublished).
MR 0538396