@article{MV_1976_28_1_a5,
     author = {S. Czerwik},
     title = {On the existence of a {Lipschitz} solution of a functional equation},
     journal = {Matemati\v{c}ki vesnik},
     pages = {49 },
     year = {1976},
     volume = {28},
     number = {1},
     url = {http://geodesic.mathdoc.fr/item/MV_1976_28_1_a5/}
}