Voir la notice de l'article provenant de la source Math-Net.Ru
@article{IVM_1990_5_a1, author = {V. F. Gaposhkin}, title = {Series of block-orthogonal and block-independent systems}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {12--18}, publisher = {mathdoc}, number = {5}, year = {1990}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1990_5_a1/} }
V. F. Gaposhkin. Series of block-orthogonal and block-independent systems. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 5 (1990), pp. 12-18. http://geodesic.mathdoc.fr/item/IVM_1990_5_a1/