Tian, Yuzhou; Zhao, Yulin Global phase portraits and bifurcation diagrams for Hamiltonian systems of linear plus quartic homogeneous polynomials symmetric with respect to the \(y\)-axis. (English) Zbl 1442.37070 Nonlinear Anal., Theory Methods Appl., Ser. A, Theory Methods 192, Article ID 111658, 27 p. (2020). Reviewer: Cristian Lăzureanu (Timisoara) MSC: 37J20 70K05 70H33 34C05 34C07 PDFBibTeX XMLCite \textit{Y. Tian} and \textit{Y. Zhao}, Nonlinear Anal., Theory Methods Appl., Ser. A, Theory Methods 192, Article ID 111658, 27 p. (2020; Zbl 1442.37070) Full Text: DOI
da Cruz, Leonardo P. C.; Romanovski, Valery G.; Torregrosa, J. The center and cyclicity problems for quartic linear-like reversible systems. (English) Zbl 1446.34046 Nonlinear Anal., Theory Methods Appl., Ser. A, Theory Methods 190, Article ID 111593, 19 p. (2020). Reviewer: Alexander Rudenok (Minsk) MSC: 34C05 34C07 34C23 34C25 34C14 PDFBibTeX XMLCite \textit{L. P. C. da Cruz} et al., Nonlinear Anal., Theory Methods Appl., Ser. A, Theory Methods 190, Article ID 111593, 19 p. (2020; Zbl 1446.34046) Full Text: DOI Link
Broer, Henk W.; Gaiko, Valery A. Global qualitative analysis of a quartic ecological model. (English) Zbl 1364.34070 Nonlinear Anal., Theory Methods Appl., Ser. A, Theory Methods 72, No. 2, 628-634 (2010). MSC: 34C60 34C05 34C07 34C23 92D40 PDFBibTeX XMLCite \textit{H. W. Broer} and \textit{V. A. Gaiko}, Nonlinear Anal., Theory Methods Appl., Ser. A, Theory Methods 72, No. 2, 628--634 (2010; Zbl 1364.34070) Full Text: DOI arXiv Link