[1] J. Aczél: Lectures on Functional Equations and their Applications. Academic Press, New York 1966. MR 0208210

[2] J. Aczél Z. Daroczy: On Measures of Information and their characterizations. Academic Press, London 1975. MR 0689178

[3] M. Belis S. Guiaşu: A quantitative-qualitative measure of information in cybernetic systems. IEEE Trans. Information Theory 14 (1968), 593 - 594.

[4] B. Bouchon: Useful Information and Questionnaires. Information and Control 13 (1976), 368-378. MR 0439408 | Zbl 0356.94019

[5] T. W. Chaundy J. B. McLeod: On a functional Equation. Proc. Edinburgh Math. Soc. [2] 12 (1960) (Edinburgh Math. Notes 43, 7-8). MR 0151748

[6] H. Emptoz: Information de type $\beta$ intégrant un concept d'utilité. C. R. Acad. Sci Paris 282A (1976), 911-914. MR 0444296 | Zbl 0327.94021

[7] S. Giaşu: Weighted Entropy. Reports on Mathematical Physics 2 (1971), 165-179. MR 0289206

[8] Pl. Kannappan: On Shannon's Entropy, Directed Divergence and Inaccuracy. Z. Wahrscheinlichkeitstheorie und verw. Gebiete 22 (1972), 95-100. MR 0308635 | Zbl 0241.94020

[9] Pl. Kannappan: On Directed Divergence and Inaccuracy. Z. Wahrscheinlichkeitstheorie und verw. Gebiete 25 (1972), 49-55. MR 0437210 | Zbl 0248.94029

[10] D. F. Kerridge: Inaccuracy and Inference. J. Roy. Statist. Soc. ser. B 23 (1961), 184-194. MR 0123375 | Zbl 0112.10302

[11] C. F. Picard: Graphes et Questionnaires. Gauthier-Villars, Paris 1972. Zbl 0266.94018

[12] C. F. Picard: Propriétés d'additivité de l'information de type $\beta$. C. R. Acad. Sci. Paris 282/1 (1976), 915-918. MR 0446735 | Zbl 0327.94022