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@article{MZM_1969_6_6_a10, author = {A. N. Slepchenko}, title = {On orthogonal bases in $L$}, journal = {Matemati\v{c}eskie zametki}, pages = {749--758}, publisher = {mathdoc}, volume = {6}, number = {6}, year = {1969}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1969_6_6_a10/} }
A. N. Slepchenko. On orthogonal bases in $L$. Matematičeskie zametki, Tome 6 (1969) no. 6, pp. 749-758. http://geodesic.mathdoc.fr/item/MZM_1969_6_6_a10/