@article{GDZPPN002549972, title = {On a theorem of B. Barna. (Short Communication).}, journal = {Aequationes mathematicae}, volume = {20}, year = {1980}, pages = {115-115}, url = {http://dml.mathdoc.fr/item/GDZPPN002549972} }
Kuczma, Marek. On a theorem of B. Barna. (Short Communication).. Aequationes mathematicae, Tome 20 (1980) p. 115. http://gdmltest.u-ga.fr/item/GDZPPN002549972/