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@article{PORMA_1976__35_4_115294, author = {Morgado, Jos\'e}, title = {Another generalization of {Euler's} theorem}, journal = {Portugaliae mathematica}, pages = {241--243}, publisher = {mathdoc}, volume = {35}, number = {4}, year = {1976}, mrnumber = {0469857}, zbl = {0368.10005}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1976__35_4_115294/} }
Morgado, José. Another generalization of Euler's theorem. Portugaliae mathematica, Tome 35 (1976) no. 4, pp. 241-243. http://geodesic.mathdoc.fr/item/PORMA_1976__35_4_115294/