@article{MV_1965_17_1_a14,
     author = {J. K. Jong},
     title = {A class of the functional equation},
     journal = {Matemati\v{c}ki vesnik},
     pages = {83 },
     year = {1965},
     volume = {17},
     number = {1},
     url = {http://geodesic.mathdoc.fr/item/MV_1965_17_1_a14/}
}