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@article{AM2_1980__21_182428, author = {Marek Kuczma}, title = {On a theorem of {B.} {Barna.}}, journal = {Aequationes mathematicae}, pages = {173--178}, publisher = {mathdoc}, volume = {21}, year = {1980}, zbl = {0487.26001}, url = {http://geodesic.mathdoc.fr/item/AM2_1980__21_182428/} }
Marek Kuczma. On a theorem of B. Barna.. Aequationes mathematicae, Tome 21 (1980), pp. 173-178. http://geodesic.mathdoc.fr/item/AM2_1980__21_182428/