Wiener, Z. Instability with two zero frequencies. (English) Zbl 0792.34046 J. Differ. Equations 103, No. 1, 58-67 (1993). Reviewer: L.M.Perko (Flagstaff) MSC: 34D05 34A25 34A09 37C75 34C05 PDF BibTeX XML Cite \textit{Z. Wiener}, J. Differ. Equations 103, No. 1, 58--67 (1993; Zbl 0792.34046) Full Text: DOI OpenURL
Palamides, P. K.; Sficas, Y. G.; Staikos, V. A. Asymptotic behavior of Caratheodory systems: Anti-Lyapunov method. (English) Zbl 0419.34047 J. Differ. Equations 36, 442-457 (1980). MSC: 34D05 34C11 PDF BibTeX XML Cite \textit{P. K. Palamides} et al., J. Differ. Equations 36, 442--457 (1980; Zbl 0419.34047) Full Text: DOI OpenURL