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@article{DAN_1976_228_6_a1, author = {S. M. Vishik}, title = {On invariant characteristics of quadratically nonlinear systems of cascade type}, journal = {Doklady Akademii Nauk}, pages = {1269--1272}, publisher = {mathdoc}, volume = {228}, number = {6}, year = {1976}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1976_228_6_a1/} }
S. M. Vishik. On invariant characteristics of quadratically nonlinear systems of cascade type. Doklady Akademii Nauk, Tome 228 (1976) no. 6, pp. 1269-1272. http://geodesic.mathdoc.fr/item/DAN_1976_228_6_a1/