Geodesic
On distinguishing center and focus
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 6 (1963), pp. 98-108.

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     author = {I. S. Kukles and T. Nurov},
     title = {On distinguishing center and focus},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {98--108},
     publisher = {mathdoc},
     number = {6},
     year = {1963},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1963_6_a12/}
}
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I. S. Kukles; T. Nurov. On distinguishing center and focus. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 6 (1963), pp. 98-108. http://geodesic.mathdoc.fr/item/IVM_1963_6_a12/