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Han, Maoan; Zhuo, Xianglai; Li, Luqun A qualitative study of space quadratic systems with a first integral. (English) Zbl 1016.34027 Northeast. Math. J. 15, No. 1, 9-15 (1999). MSC: 34C05 34C25 PDF BibTeX XML Cite \textit{M. Han} et al., Northeast. Math. J. 15, No. 1, 9--15 (1999; Zbl 1016.34027) OpenURL
Li, Yi; Muldowney, James S. On Bendixson’s criterion. (English) Zbl 0786.34033 J. Differ. Equations 106, No. 1, 27-39 (1993). MSC: 34C05 PDF BibTeX XML Cite \textit{Y. Li} and \textit{J. S. Muldowney}, J. Differ. Equations 106, No. 1, 27--39 (1993; Zbl 0786.34033) Full Text: DOI OpenURL
Yakubovich, V. A. Singular problem in optimal control of linear stationary system with quadratic functional. (English) Zbl 0602.49001 Sib. Math. J. 26, 148-158 (1985). MSC: 49J15 49J30 93C05 34C05 93C15 PDF BibTeX XML Cite \textit{V. A. Yakubovich}, Sib. Math. J. 26, 148--158 (1985; Zbl 0602.49001) Full Text: DOI OpenURL
Chernyshev, V. E. Geschlossene Trajektorien in der Umgebung eines invarianten Torus. (Russian) Zbl 0426.34021 Differ. Uravn. 16, 374-376 (1980). MSC: 34C05 PDF BibTeX XML Cite \textit{V. E. Chernyshev}, Differ. Uravn. 16, 374--376 (1980; Zbl 0426.34021) OpenURL