Geodesic
Conditions for the nonoscillation of solutions of systems of second-order differential equations
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 5 (2000), pp. 12-18 
M. K. Bugir. Conditions for the nonoscillation of solutions of systems of second-order differential equations. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 5 (2000), pp. 12-18. http://geodesic.mathdoc.fr/item/IVM_2000_5_a1/
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     url = {http://geodesic.mathdoc.fr/item/IVM_2000_5_a1/}
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