Offin, Daniel C. Variational structure of the zones of instability. (English) Zbl 1161.34333 Differ. Integral Equ. 14, No. 9, 1111-1127 (2001). Cited in 4 Documents MSC: 34C25 Periodic solutions to ordinary differential equations 34D08 Characteristic and Lyapunov exponents of ordinary differential equations 53D12 Lagrangian submanifolds; Maslov index PDF BibTeX XML Cite \textit{D. C. Offin}, Differ. Integral Equ. 14, No. 9, 1111--1127 (2001; Zbl 1161.34333)