Keener, M. S.; Travis, C. C. The Perron-Frobenius theorem for differential systems. (English) Zbl 0542.34023 Boll. Unione Mat. Ital., VI. Ser., A 3, 203-212 (1984). Reviewer: A.L.Andrew MSC: 34L99 15B48 PDFBibTeX XMLCite \textit{M. S. Keener} and \textit{C. C. Travis}, Boll. Unione Mat. Ital., VI. Ser., A 3, 203--212 (1984; Zbl 0542.34023)
Keener, M. S.; Travis, C. C. Sturmian theory for a class of nonselfadjoint differential systems. (English) Zbl 0435.34021 Ann. Mat. Pura Appl., IV. Ser. 123, 247-266 (1980). MSC: 34C05 34C10 PDFBibTeX XMLCite \textit{M. S. Keener} and \textit{C. C. Travis}, Ann. Mat. Pura Appl. (4) 123, 247--266 (1980; Zbl 0435.34021) Full Text: DOI
Keener, M. S.; Travis, C. C. Positive cones and focal points for a class of \(n\)th order differential equations. (English) Zbl 0404.35017 Trans. Am. Math. Soc. 237, 331-351 (1978). MSC: 35C10 35B05 35B10 34B10 34L99 47B60 47E05 PDFBibTeX XMLCite \textit{M. S. Keener} and \textit{C. C. Travis}, Trans. Am. Math. Soc. 237, 331--351 (1978; Zbl 0404.35017) Full Text: DOI