Hermann, Robert; Martin, Clyde Lie and Morse theory for periodic orbits of vector fields and matrix Riccati equations. II. (English) Zbl 0527.58033 Math. Syst. Theory 16, No. 4, 297-306 (1983). MSC: 37G99 PDFBibTeX XMLCite \textit{R. Hermann} and \textit{C. Martin}, Math. Syst. Theory 16, 297--306 (1983; Zbl 0527.58033) Full Text: DOI
Hermann, Robert The theory of equivalence of Pfaffian systems and input systems under feedback. (English) Zbl 0544.93029 Math. Syst. Theory 15, 343-356 (1982). Reviewer: K.Tchon MSC: 93C10 58A17 93B10 93C15 58A10 58A15 58A30 PDFBibTeX XMLCite \textit{R. Hermann}, Math. Syst. Theory 15, 343--356 (1982; Zbl 0544.93029) Full Text: DOI
Hermann, Robert; Martin, Clyde Lie and Morse theory for periodic orbits of vector fields and matrix Riccati equations. I: General Lie-theoretic methods. (English) Zbl 0508.58034 Math. Syst. Theory 15, 277-284 (1982). MSC: 37G99 53C30 PDFBibTeX XMLCite \textit{R. Hermann} and \textit{C. Martin}, Math. Syst. Theory 15, 277--284 (1982; Zbl 0508.58034) Full Text: DOI