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DOI: https://doi.org/10.1070/SM1967v002n01ABEH002332

Received: 21.03.1967

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Citation: E. M. Landis, I. G. Petrovskii, “Letter to the Editors”, Math. USSR-Sb., 2:1 (1967), 141

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https://www.mathnet.ru/eng/sm4112

https://doi.org/10.1070/SM1967v002n01ABEH002332

https://www.mathnet.ru/eng/sm/v115/i1/p160

Errata

• 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
  Mat. Sb. (N.S.), 1955, 37(79):2, 209–250
• Corrections to the articles "On the number of limit cycles of the equations $\dfrac{dy}{dx}=\dfrac{P(x,y)}{Q(x,y)}$, where $P$ and $Q$ are polynomials of $2$nd degree" and "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"
  I. G. Petrovskii, E. M. Landis
  Mat. Sb. (N.S.), 1959, 48(90):2, 253–255

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