@article{ZR_1976_1_9_a10,
     author = {J\'anos Rim\'an},
     title = {On an {Extension} of {Pexider's} {Equation}},
     journal = {Zbornik radova},
     pages = {65 },
     year = {1976},
     volume = {1},
     number = {9},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ZR_1976_1_9_a10/}
}