no. R3
Generalized functional equation of two variables in information theory
Revue française d'automatique informatique recherche opérationnelle. Mathématique, Tome 6 (1972) no. R3, pp. 85-98. 
@article{M2AN_1972__6_3_85_0,
     author = {Bhu Dev Sharma and Ram Autar},
     title = {Generalized functional equation of two variables in information theory},
     journal = {Revue fran\c{c}aise d'automatique informatique recherche op\'erationnelle. Math\'ematique},
     pages = {85--98},
     publisher = {Dunod},
     address = {Paris},
     volume = {6},
     number = {R3},
     year = {1972},
     mrnumber = {360004},
     zbl = {0264.39006},
     language = {en},
     url = {http://archive.numdam.org/item/M2AN_1972__6_3_85_0/}
}
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Bhu Dev Sharma; Ram Autar. Generalized functional equation of two variables in information theory. Revue française d'automatique informatique recherche opérationnelle. Mathématique, Tome 6 (1972) no. R3, pp. 85-98. http://archive.numdam.org/item/M2AN_1972__6_3_85_0/

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[8] B. D. Sharma, On Generalized Information Functions (unpublished).

[9] B. D. Sharma and Ramautar, Functional Equation of two variables in Information Theory (communicated). | Zbl

[10] B. D. Sharma and Ramautar, On characterization of a Generalized Inaccuracy Measure in Information Theory (to appear in Journal of Applied Probability in June 1973). | MR | Zbl