Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DE_1981_17_5_a1, author = {S. K. Bloshanskaya}, title = {On a necessary condition for being a basis}, journal = {Differencialʹnye uravneni\^a}, pages = {778--788}, publisher = {mathdoc}, volume = {17}, number = {5}, year = {1981}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1981_17_5_a1/} }
S. K. Bloshanskaya. On a necessary condition for being a basis. Differencialʹnye uravneniâ, Tome 17 (1981) no. 5, pp. 778-788. http://geodesic.mathdoc.fr/item/DE_1981_17_5_a1/