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@article{PORMA_1964__23_1_114916, author = {Morgado, Jos\'e}, title = {On the arithmetical function $\sigma _k^*$}, journal = {Portugaliae mathematica}, pages = {35--40}, publisher = {mathdoc}, volume = {23}, number = {1}, year = {1964}, mrnumber = {0173652}, zbl = {0146.05203}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1964__23_1_114916/} }
Morgado, José. On the arithmetical function $\sigma _k^*$. Portugaliae mathematica, Tome 23 (1964) no. 1, pp. 35-40. http://geodesic.mathdoc.fr/item/PORMA_1964__23_1_114916/