Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1957_112_2_a19, author = {G. M. Ulanov}, title = {Invariance up to~$\varepsilon$ in linear combined automatically controlled systems}, journal = {Doklady Akademii Nauk}, pages = {253--256}, publisher = {mathdoc}, volume = {112}, number = {2}, year = {1957}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1957_112_2_a19/} }
G. M. Ulanov. Invariance up to~$\varepsilon$ in linear combined automatically controlled systems. Doklady Akademii Nauk, Tome 112 (1957) no. 2, pp. 253-256. http://geodesic.mathdoc.fr/item/DAN_1957_112_2_a19/