Geodesic
Some problems in the qualitative study of differential equations in the plane
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 6 (1961), pp. 82-88.

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     author = {N. V. Medvedev},
     title = {Some problems in the qualitative study of differential equations in the plane},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {82--88},
     publisher = {mathdoc},
     number = {6},
     year = {1961},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1961_6_a9/}
}
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N. V. Medvedev. Some problems in the qualitative study of differential equations in the plane. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 6 (1961), pp. 82-88. http://geodesic.mathdoc.fr/item/IVM_1961_6_a9/