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@article{DAN_1968_178_3_a5, author = {I. Il'yasov}, title = {The summation of composite functions of {Euler's} function}, journal = {Doklady Akademii Nauk}, pages = {529--532}, publisher = {mathdoc}, volume = {178}, number = {3}, year = {1968}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1968_178_3_a5/} }
I. Il'yasov. The summation of composite functions of Euler's function. Doklady Akademii Nauk, Tome 178 (1968) no. 3, pp. 529-532. http://geodesic.mathdoc.fr/item/DAN_1968_178_3_a5/