On the oscillation of solutions of systems of second-order differential equations
Differencialʹnye uravneniâ, Tome 23 (1987) no. 2, pp. 204-217.

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     author = {A. I. Bulgakov},
     title = {On the oscillation of solutions of systems of second-order differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {204--217},
     publisher = {mathdoc},
     volume = {23},
     number = {2},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1987_23_2_a3/}
}
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A. I. Bulgakov. On the oscillation of solutions of systems of second-order differential equations. Differencialʹnye uravneniâ, Tome 23 (1987) no. 2, pp. 204-217. http://geodesic.mathdoc.fr/item/DE_1987_23_2_a3/