@article{ZR_1976_1_9_a7,
     author = {Gyula Maksa},
     title = {A {Functional} {Equation} with {Differences}},
     journal = {Zbornik radova},
     pages = {49 },
     publisher = {mathdoc},
     volume = {1},
     number = {9},
     year = {1976},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ZR_1976_1_9_a7/}
}