Geodesic
A remark on Nehari-type oscillation criteria for self-adjoint linear differential equations
Commentationes Mathematicae Universitatis Carolinae, Tome 32 (1991) no. 3, pp. 447-462.

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Oscillation criteria of Nehari-type for the equation $(-1)^n(x^{\alpha}y^{(n)})^{(n)} + q(x)y = 0$, $\alpha\in {\bold R}$, are established. These criteria impose no sign restriction on the function $q(x)$ and generalize some recent results of the second author.
Classification : 34A30, 34C10
Keywords: Nehari-type oscillation criteria; conjugate points; self-adjoint equation; principal solution 
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     title = {A remark on {Nehari-type} oscillation criteria for self-adjoint linear differential equations},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
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Došlý, Ondřej; Fiedler, Frank. A remark on Nehari-type oscillation criteria for self-adjoint linear differential equations. Commentationes Mathematicae Universitatis Carolinae, Tome 32 (1991) no. 3, pp. 447-462. http://geodesic.mathdoc.fr/item/CMUC_1991__32_3_a6/