On a~criterion for the existence of limit cycles
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 11 (1986), pp. 11-14.

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@article{IVM_1986_11_a1,
     author = {M. I. Gil' and L. L. Shargorodskaya},
     title = {On a~criterion for the existence of limit cycles},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {11--14},
     publisher = {mathdoc},
     number = {11},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1986_11_a1/}
}
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M. I. Gil'; L. L. Shargorodskaya. On a~criterion for the existence of limit cycles. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 11 (1986), pp. 11-14. http://geodesic.mathdoc.fr/item/IVM_1986_11_a1/