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@article{DE_1976_12_11_a8, author = {N. N. Ladis}, title = {Normal forms of completely integrable systems}, journal = {Differencialʹnye uravneni\^a}, pages = {1994--1999}, publisher = {mathdoc}, volume = {12}, number = {11}, year = {1976}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1976_12_11_a8/} }
N. N. Ladis. Normal forms of completely integrable systems. Differencialʹnye uravneniâ, Tome 12 (1976) no. 11, pp. 1994-1999. http://geodesic.mathdoc.fr/item/DE_1976_12_11_a8/