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@article{PORMA_1977__36_2_115311, author = {Morgado, Jos\'e}, title = {Some remarks on two generalizations of {Euler's} theorem}, journal = {Portugaliae mathematica}, pages = {153--158}, publisher = {mathdoc}, volume = {36}, number = {2}, year = {1977}, mrnumber = {0577419}, zbl = {0434.10004}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1977__36_2_115311/} }
Morgado, José. Some remarks on two generalizations of Euler's theorem. Portugaliae mathematica, Tome 36 (1977) no. 2, pp. 153-158. http://geodesic.mathdoc.fr/item/PORMA_1977__36_2_115311/