Sanchez, Luis Angel The torus principle for three-dimensional analytic autonomous systems having negative divergence. (English) Zbl 1026.34048 Nonlinear Anal., Theory Methods Appl., Ser. A, Theory Methods 44, No. 7, 943-956 (2001). Reviewer: George Seifert (MR 2003c:37028) MSC: 34C25 34C27 × Cite Format Result Cite Review PDF Full Text: DOI
Sherman, S. A third-order nonlinear system arising from a nuclear spin generator. (English) Zbl 0134.30901 Contrib. Differ. Equations 2, 197-227 (1963). Reviewer: J. O. C. Ezeilo MSC: 34-XX × Cite Format Result Cite Review PDF