@article{02129195,
title = {On a problem of A. Lupa\c s.},
journal = {General Mathematics},
volume = {6},
year = {1998},
pages = {3-10},
zbl = {1052.41516},
language = {en},
url = {http://dml.mathdoc.fr/item/02129195}
}
Agratini, Octavian. On a problem of A. Lupaş.. General Mathematics, Tome 6 (1998) pp. 3-10. http://gdmltest.u-ga.fr/item/02129195/