@article{MV_1966_18_3_a0,
     author = {M. Hossz\'u},
     title = {On some functional equations and on their classification},
     journal = {Matemati\v{c}ki vesnik},
     pages = {139 },
     year = {1966},
     volume = {18},
     number = {3},
     url = {http://geodesic.mathdoc.fr/item/MV_1966_18_3_a0/}
}