@article{AM2_1971__7_136244,
     author = {M. ZDUN},
     title = {On the {Uniqueness} of {Solutions} of the {Functional} {Equation} ... (x + f (x)) = ?(x)+?(f (x)) {(Short} {Communication)}},
     journal = {Aequationes mathematicae},
     pages = {124--124},
     publisher = {mathdoc},
     volume = {7},
     year = {1971},
     url = {http://geodesic.mathdoc.fr/item/AM2_1971__7_136244/}
}