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Álvarez, M. J.; Gasull, A.; Prohens, R. Limit cycles for cubic systems with a symmetry of order 4 and without infinite critical points. (English) Zbl 1142.34017 Proc. Am. Math. Soc. 136, No. 3, 1035-1043 (2008). Reviewer: Alexander Grin (Grodno) MSC: 34C07 34C23 37C27 34C14 PDFBibTeX XMLCite \textit{M. J. Álvarez} et al., Proc. Am. Math. Soc. 136, No. 3, 1035--1043 (2008; Zbl 1142.34017) Full Text: DOI