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@article{DAN_1957_116_5_a8, author = {A. K. Pokalo}, title = {On the summation of functions of the $B^{(r)}$ classes}, journal = {Doklady Akademii Nauk}, pages = {750--753}, publisher = {mathdoc}, volume = {116}, number = {5}, year = {1957}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1957_116_5_a8/} }
A. K. Pokalo. On the summation of functions of the $B^{(r)}$ classes. Doklady Akademii Nauk, Tome 116 (1957) no. 5, pp. 750-753. http://geodesic.mathdoc.fr/item/DAN_1957_116_5_a8/