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@article{PORMA_1977__36_1_115295, author = {Maloney, John P.}, title = {A non graph theory approach to {Ulam's} conjecture}, journal = {Portugaliae mathematica}, pages = {1--6}, publisher = {mathdoc}, volume = {36}, number = {1}, year = {1977}, mrnumber = {0535216}, zbl = {0435.05049}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1977__36_1_115295/} }
Maloney, John P. A non graph theory approach to Ulam's conjecture. Portugaliae mathematica, Tome 36 (1977) no. 1, pp. 1-6. http://geodesic.mathdoc.fr/item/PORMA_1977__36_1_115295/