@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/