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@article{DAN_1977_232_5_a5, author = {A. P. Kombarov}, title = {Normal $\sigma$-products}, journal = {Doklady Akademii Nauk}, pages = {1004--1007}, publisher = {mathdoc}, volume = {232}, number = {5}, year = {1977}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1977_232_5_a5/} }
A. P. Kombarov. Normal $\sigma$-products. Doklady Akademii Nauk, Tome 232 (1977) no. 5, pp. 1004-1007. http://geodesic.mathdoc.fr/item/DAN_1977_232_5_a5/