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@article{DAN_1991_316_5_a7, author = {A. I. Tret'yak}, title = {Necessary conditions for optimality of even order in a}, journal = {Doklady Akademii Nauk}, pages = {1058--1060}, publisher = {mathdoc}, volume = {316}, number = {5}, year = {1991}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1991_316_5_a7/} }
A. I. Tret'yak. Necessary conditions for optimality of even order in a. Doklady Akademii Nauk, Tome 316 (1991) no. 5, pp. 1058-1060. http://geodesic.mathdoc.fr/item/DAN_1991_316_5_a7/