Geodesic
Quadratic integrals of linear systems of differential equations
Differencialʹnye uravneniâ, Tome 6 (1970) no. 2, pp. 381-384.

Voir la notice de l'article provenant de la source Math-Net.Ru

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     author = {N. A. Zboychik},
     title = {Quadratic integrals of linear systems of differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {381--384},
     publisher = {mathdoc},
     volume = {6},
     number = {2},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1970_6_2_a19/}
}
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N. A. Zboychik. Quadratic integrals of linear systems of differential equations. Differencialʹnye uravneniâ, Tome 6 (1970) no. 2, pp. 381-384. http://geodesic.mathdoc.fr/item/DE_1970_6_2_a19/