Geodesic
Ability of the solutions of a system of nonlinear differential equations to oscillate
Matematičeskie zametki, Tome 16 (1974) no. 4, pp. 571-576 Cet article a éte moissonné depuis la source Math-Net.Ru

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We prove sufficient conditions and also necessary and sufficient conditions for the proper solutions of the system $$ u'_i=f_i(t,u_1,u_2)\quad(i=1,2). $$ to be able to oscillate. 
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     author = {J. D. Mirzov},
     title = {Ability of the solutions of a~system of nonlinear differential equations to oscillate},
     journal = {Matemati\v{c}eskie zametki},
     pages = {571--576},
     year = {1974},
     volume = {16},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1974_16_4_a8/}
}
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J. D. Mirzov. Ability of the solutions of a system of nonlinear differential equations to oscillate. Matematičeskie zametki, Tome 16 (1974) no. 4, pp. 571-576. http://geodesic.mathdoc.fr/item/MZM_1974_16_4_a8/