@Article{Wilczyński2012,
author = "Wilczyński, Paweł",
title = "Planar nonautonomous polynomial equations IV. Nonholomorphic case",
journal = "Opuscula Math.",
year = "2012",
volume = "32",
number = "2",
pages = "357--375",
doi = "http://dx.doi.org/10.7494/OpMath.2012.32.2.357",
url = "http://dx.doi.org/10.7494/OpMath.2012.32.2.357",
abstract = "We give a few sufficient conditions for the existence of periodic solutions of the equation \(\dot{z}=\sum_{j=0}^n a_j(t)z^j-\sum_{k=1}^r c_k(t)\overline{z}^k\) where \(n \gt r\) and \(a_j\)'s, \(c_k\)'s are complex valued. We prove the existence of one up to two periodic solutions.",
keywords = "periodic orbits, polynomial equations",
issn = "1232-9274"
}