Geodesic
Oscillation and nonoscillation of higher order self-adjoint differential equations
Czechoslovak Mathematical Journal, Tome 52 (2002) no. 4, pp. 833-849.

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Oscillation and nonoscillation criteria for the higher order self-adjoint differential equation \[ (-1)^n(t^{\alpha }y^{(n)})^{(n)}+q(t)y=0 \qquad \mathrm{(*)}\] are established. In these criteria, equation $(*)$ is viewed as a perturbation of the conditionally oscillatory equation \[ (-1)^n(t^{\alpha }y^{(n)})^{(n)}- \frac{\mu _{n,\alpha }}{t^{2n-\alpha }}y=0, \] where $\mu _{n,\alpha }$ is the critical constant in conditional oscillation. Some open problems in the theory of conditionally oscillatory, even order, self-adjoint equations are also discussed.
Classification : 34B05, 34C10
Keywords: self-adjoint differential equation; oscillation and nonoscillation criteria; variational method; conditional oscillation 
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     title = {Oscillation and nonoscillation of higher order self-adjoint differential equations},
     journal = {Czechoslovak Mathematical Journal},
     pages = {833--849},
     publisher = {mathdoc},
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     zbl = {1023.34028},
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Došlý, Ondřej; Osička, Jan. Oscillation and nonoscillation of higher order self-adjoint differential equations. Czechoslovak Mathematical Journal, Tome 52 (2002) no. 4, pp. 833-849. http://geodesic.mathdoc.fr/item/CMJ_2002__52_4_a14/