Vasić, P. M.; Janić, R. R.; Pečarić, J. E. On some functional equations of Pexider’s type. (English) Zbl 0484.39003 Publ. Elektroteh. Fak., Univ. Beogr., Ser. Mat. Fiz. 716-734, 25-31 (1981). MSC: 39B62 39B99 PDFBibTeX XMLCite \textit{P. M. Vasić} et al., Publ. Elektroteh. Fak., Univ. Beogr., Ser. Mat. Fiz. 716--734, 25--31 (1981; Zbl 0484.39003)
Janić, Radovan R.; Pečarić, Josip E. Some functional equations with several unknown functions. (English) Zbl 0442.39004 Publ. Elektroteh. Fak., Univ. Beogr., Ser. Mat. Fiz. 634-677, 228-233 (1979). MSC: 39B62 30D05 PDFBibTeX XMLCite \textit{R. R. Janić} and \textit{J. E. Pečarić}, Publ. Elektroteh. Fak., Univ. Beogr., Ser. Mat. Fiz. 634--677, 228--233 (1979; Zbl 0442.39004)
Martic, Branislav; Janic, Radovan R. Sur quelques généralisations des équations fonctionnelles. (French) Zbl 0448.39004 Publ. Elektroteh. Fak., Univ. Beogr., Ser. Mat. Fiz. 602-633, 223-228 (1978). MSC: 39B99 39B62 PDFBibTeX XMLCite \textit{B. Martic} and \textit{R. R. Janic}, Publ. Elektroteh. Fak., Univ. Beogr., Ser. Mat. Fiz. 602--633, 223--228 (1978; Zbl 0448.39004)