@article{2805, author = {Maloney, John P.}, title = {A non graph theory approach to Ulam's conjecture}, journal = {Portugaliae mathematica}, volume = {36}, year = {1977}, pages = {1-6}, zbl = {0435.05049}, mrnumber = {0535216}, language = {en}, url = {http://dml.mathdoc.fr/item/2805} }
Maloney, John P. A non graph theory approach to Ulam's conjecture. Portugaliae mathematica, Tome 36 (1977) pp. 1-6. http://gdmltest.u-ga.fr/item/2805/