Roussarie, Robert; Rousseau, Christiane Finite cyclicity of some center graphics through a nilpotent point inside quadratic systems. (English) Zbl 1334.34077 Trans. Mosc. Math. Soc. 2015, 181-218 (2015) and Tr. Mosk. Mat. O.-va 76, No. 2, 205-248 (2015). MSC: 34C07 37G15 34C37 34C23 34C05 PDFBibTeX XMLCite \textit{R. Roussarie} and \textit{C. Rousseau}, Trans. Mosc. Math. Soc. 2015, 181--218 (2015; Zbl 1334.34077) Full Text: DOI arXiv
Fishkin, A. Yu. On the number of limit cycles of planar quadratic vector fields with a perturbed center. (English. Russian original) Zbl 1218.34035 Trans. Mosc. Math. Soc. 2010, 105-139 (2010); translation from Tr. Mosk. Mat. O.-va. 71, 119-161 (2010). Reviewer: Jaume Giné (Lleida) MSC: 34C07 34C05 34E10 PDFBibTeX XMLCite \textit{A. Yu. Fishkin}, Trans. Mosc. Math. Soc. 2010, 105--139 (2010; Zbl 1218.34035); translation from Tr. Mosk. Mat. O.-va. 71, 119--161 (2010) Full Text: DOI
Medvedeva, N. B.; Mazaeva, E. V. A sufficient condition for a focus for a monodromic singular point. (English. Russian original) Zbl 1330.37024 Trans. Mosc. Math. Soc. 2002, 77-103 (2002); translation from Tr. Mosk. Mat. O.-va 63, 87-114 (2002). MSC: 37C10 34C05 37F75 58K10 PDFBibTeX XMLCite \textit{N. B. Medvedeva} and \textit{E. V. Mazaeva}, Trans. Mosc. Math. Soc. 2002, 77--103 (2002; Zbl 1330.37024); translation from Tr. Mosk. Mat. O.-va 63, 87--114 (2002)