@article{GDZPPN002037874, title = {On a problem of A.D. Sands.}, journal = {Aequationes mathematicae}, volume = {38}, year = {1989}, pages = {186-191}, zbl = {0685.20023}, url = {http://dml.mathdoc.fr/item/GDZPPN002037874} }
Szabó, Sándor. On a problem of A.D. Sands.. Aequationes mathematicae, Tome 38 (1989) pp. 186-191. http://gdmltest.u-ga.fr/item/GDZPPN002037874/