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JOURNALS
// Matematicheskii Sbornik
// Archive
Mat. Sb. (N.S.),
1955
Volume 37(79),
Number 2,
Pages
209–250
(Mi sm5216)
This article is cited in
13
papers
On the number of limit cycles of the equation
$\dfrac{dy}{dx}=\dfrac{P(x,y)}{Q(x,y)}$
, where
$P$
and
$Q$
are polynomials of 2nd degree
I. G. Petrovskii
,
E. M. Landis
Received:
04.03.1955
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