@article{AM2_1975__12_136495,
     author = {Karol Baron},
     title = {On {Extending} of {Solutions} of a {Functional} {Equation.} {(Short} {Communication).}},
     journal = {Aequationes mathematicae},
     pages = {114--115},
     publisher = {mathdoc},
     volume = {12},
     year = {1975},
     zbl = {0344.39006},
     url = {http://geodesic.mathdoc.fr/item/AM2_1975__12_136495/}
}