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@article{BAG_1984__17_138267, author = {Gerd Richter}, title = {On a problem of {Kertesz} and {Stern}}, journal = {Beitr\"age zur Algebra und Geometrie}, pages = {111--114}, publisher = {mathdoc}, volume = {17}, year = {1984}, zbl = {0538.06006}, url = {http://geodesic.mathdoc.fr/item/BAG_1984__17_138267/} }
Gerd Richter. On a problem of Kertesz and Stern. Beiträge zur Algebra und Geometrie, Tome 17 (1984), pp. 111-114. http://geodesic.mathdoc.fr/item/BAG_1984__17_138267/