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@article{PORMA_1968__27_4_115074, author = {Horadam, E.M.}, title = {Normal order for divisor functions of generalized integers}, journal = {Portugaliae mathematica}, pages = {201--207}, publisher = {mathdoc}, volume = {27}, number = {4}, year = {1968}, mrnumber = {0266882}, zbl = {0198.07002}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1968__27_4_115074/} }
Horadam, E.M. Normal order for divisor functions of generalized integers. Portugaliae mathematica, Tome 27 (1968) no. 4, pp. 201-207. http://geodesic.mathdoc.fr/item/PORMA_1968__27_4_115074/