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@article{ELMA_1982__37_141298, author = {Andrzej Makowski}, title = {On a problem of {Erd\"os} and {Graham.}}, journal = {Elemente der Mathematik}, pages = {163--163}, publisher = {mathdoc}, volume = {37}, year = {1982}, zbl = {0488.10004}, url = {http://geodesic.mathdoc.fr/item/ELMA_1982__37_141298/} }
Andrzej Makowski. On a problem of Erdös and Graham.. Elemente der Mathematik, Tome 37 (1982), p. 163. http://geodesic.mathdoc.fr/item/ELMA_1982__37_141298/