A differential system with two purely imaginary roots of a characteristic equation
Differencialʹnye uravneniâ, Tome 16 (1980) no. 6, pp. 963-979.

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     title = {A differential system with two purely imaginary roots of a characteristic equation},
     journal = {Differencialʹnye uravneni\^a},
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È. I. Grudo. A differential system with two purely imaginary roots of a characteristic equation. Differencialʹnye uravneniâ, Tome 16 (1980) no. 6, pp. 963-979. http://geodesic.mathdoc.fr/item/DE_1980_16_6_a0/