Voir la notice de l'article provenant de la source Math-Net.Ru
@article{TRSPY_1987_180_a42, author = {V. L. Velikin}, title = {Approximation in {a~Banach} space by a~convergent sequence of subspaces of fixed dimension}, journal = {Informatics and Automation}, pages = {81--82}, publisher = {mathdoc}, volume = {180}, year = {1987}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/TRSPY_1987_180_a42/} }
V. L. Velikin. Approximation in a~Banach space by a~convergent sequence of subspaces of fixed dimension. Informatics and Automation, Theory of functions and related questions of analysis, Tome 180 (1987), pp. 81-82. http://geodesic.mathdoc.fr/item/TRSPY_1987_180_a42/