Certain sufficient conditions for instability of the solutions of second order linear differential equations
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 6 (1969), pp. 58-61.

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@article{IVM_1969_6_a6,
     author = {I. I. Endovickii},
     title = {Certain sufficient conditions for instability of the solutions of second order linear differential equations},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {58--61},
     publisher = {mathdoc},
     number = {6},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1969_6_a6/}
}
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I. I. Endovickii. Certain sufficient conditions for instability of the solutions of second order linear differential equations. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 6 (1969), pp. 58-61. http://geodesic.mathdoc.fr/item/IVM_1969_6_a6/