Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DE_1974_10_3_a14, author = {Yu. K. Lando}, title = {Controllable operators}, journal = {Differencialʹnye uravneni\^a}, pages = {531--536}, publisher = {mathdoc}, volume = {10}, number = {3}, year = {1974}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1974_10_3_a14/} }
Yu. K. Lando. Controllable operators. Differencialʹnye uravneniâ, Tome 10 (1974) no. 3, pp. 531-536. http://geodesic.mathdoc.fr/item/DE_1974_10_3_a14/