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Guggenheimer, H.
A Leighton-Borůvka formula for Morse conjugate points. (English). Archivum Mathematicum, vol. 21 (1985), issue 4, pp. 189-193
MSC: 34C05, 34H05 | MR 833130 | Zbl 0585.34024
References:
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[2] R. Freedman: Oscillation theory of systems of ordinary differential equations. Thesis, PINY 1979.
[3] H. Guggenheimer: On focal points and limit behavior of solutions of differential equations. Arch. Math. (Brno) 14 (1978) 139-144. MR 0508430
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[5] H. Guggenheimer: Applicable Geometry. Krieger, Huntington NY 1977. MR 0442821 | Zbl 0396.52001
[6] W. Leighton: Principal quadratic functionals. TAMS 67 (1949) 253-274. MR 0034535 | Zbl 0041.22404
[7] A. C. Peterson: On the monotone nature of boundary value functions for n-th order differential equations. Canad. Math. Bull. 15 (1972) 253-258. MR 0310324 | Zbl 0236.34019
[8] W. T. Reid: Ordinary Differential Equations. Wiley NY 1971. MR 0273082 | Zbl 0212.10901
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