@article{PIM_1966_N_S_06_20_a7,
     author = {D. \v{Z}. {\DJ}okovi\'c and R. \v{Z}. {\DJ}or{\dj}evi\'c and P. M. Vasi\'c},
     title = {On {A} {Class} {Of} {Functional} {Equations}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {65 },
     publisher = {mathdoc},
     volume = {_N_S_06},
     number = {20},
     year = {1966},
     url = {http://geodesic.mathdoc.fr/item/PIM_1966_N_S_06_20_a7/}
}