@article{107000, author = {Heinrich W. Guggenheimer}, title = {On focal points and limit behavior of solutions of linear differential equations}, journal = {Archivum Mathematicum}, volume = {014}, year = {1978}, pages = {139-143}, zbl = {0403.34027}, mrnumber = {0508430}, language = {en}, url = {http://dml.mathdoc.fr/item/107000} }
Guggenheimer, Heinrich W. On focal points and limit behavior of solutions of linear differential equations. Archivum Mathematicum, Tome 014 (1978) pp. 139-143. http://gdmltest.u-ga.fr/item/107000/
Lineare Differentialtransformationen 2. Ordnung, DVW, Berlin 1967; English Translation: English Universities Press, London 1971. (1967) | MR 0463539
Existence and Comparison of Eigenvalues of n-th Order Linear Differential Equations, Bull. A. M. S. 82 (1976) 350-352. (1976) | MR 0422747 | Zbl 0342.34010
Geometric Theory of Differential Equations, VI: Ljapunov Inequalities for Co-conjugate Points, Tensor (N.S.) 24 (1972) 14-18. (1972) | MR 0419936 | Zbl 0256.34037
Applicable Geometry, Krieger, Huntington NY 1977. (1977) | MR 0442821 | Zbl 0396.52001
Ordinary Differential Equations, Wiley, NY, 1964/S. Hartman Baltimore 1973. (1964) | Zbl 0125.32102
Rotation Properties of a Class of Second Order Differential Systems, J. of Diff. Equ., 17 (1975) 395-405. (1975) | MR 0372333 | Zbl 0293.34048
Disconjugacy, Lecture Notes No. 220, Springer, Berlin 1971. (1971) | MR 0460785 | Zbl 0224.34003