@article{AM2_1972__8_136294,
     author = {Marek Zdun},
     title = {On the {Uniqueness} of {Solutions} of the {Functional} {Equation} ... .},
     journal = {Aequationes mathematicae},
     pages = {229--232},
     publisher = {mathdoc},
     volume = {8},
     year = {1972},
     zbl = {0249.39004},
     url = {http://geodesic.mathdoc.fr/item/AM2_1972__8_136294/}
}