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MR73004 34.0X
Petrovskiĭ, I. G.; Landis, E. M. On the number of limit cycles of the equation $dy/dx=P(x,y)/Q(x,y)$, where $P$ and $Q$ are polynomials of 2nd degree. (Russian) Mat. Sb. N.S. 37(79) (1955), 209–250.
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