Geodesic
The oscillatory nature of the solutions of a certain system of second order ordinary differential equations
Differencialʹnye uravneniâ, Tome 9 (1973) no. 12, pp. 2146-2151 
S. N. Olekhnik. The oscillatory nature of the solutions of a certain system of second order ordinary differential equations. Differencialʹnye uravneniâ, Tome 9 (1973) no. 12, pp. 2146-2151. http://geodesic.mathdoc.fr/item/DE_1973_9_12_a3/
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     author = {S. N. Olekhnik},
     title = {The oscillatory nature of the solutions of a certain system of second order ordinary differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2146--2151},
     year = {1973},
     volume = {9},
     number = {12},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1973_9_12_a3/}
}
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