@article{GDZPPN002550385,
title = {On a theorem of B. Barna.},
journal = {Aequationes mathematicae},
volume = {20},
year = {1980},
pages = {173-178},
zbl = {0487.26001},
url = {http://dml.mathdoc.fr/item/GDZPPN002550385}
}
Kuczma, Marek. On a theorem of B. Barna.. Aequationes mathematicae, Tome 20 (1980) pp. 173-178. http://gdmltest.u-ga.fr/item/GDZPPN002550385/