@article{10_4064_ap_27_1_29_32,
     author = {Marek Kuczma},
     title = {Special solutions of a functional equation},
     journal = {Annales Polonici Mathematici},
     pages = {29--32},
     publisher = {mathdoc},
     volume = {27},
     number = {1},
     year = {1972},
     doi = {10.4064/ap-27-1-29-32},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-27-1-29-32/}
}