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@article{DAN_1963_151_1_a15, author = {L. P. Usol'tsev}, title = {On an exponential rational trigonometric sum of special type}, journal = {Doklady Akademii Nauk}, pages = {62--64}, publisher = {mathdoc}, volume = {151}, number = {1}, year = {1963}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1963_151_1_a15/} }
L. P. Usol'tsev. On an exponential rational trigonometric sum of special type. Doklady Akademii Nauk, Tome 151 (1963) no. 1, pp. 62-64. http://geodesic.mathdoc.fr/item/DAN_1963_151_1_a15/