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References:
[1] Ahmad Shair: On the oscillation of solutions of a class of linear fourth order differential equations. Рас. J. Math. 34, 1970. MR 0268455
[2] Heidel J. W.: Qualitative behavior of solutions of a third order nonlinear differential equation. Рас. J. Math., 27, 1968. MR 0240389 | Zbl 0172.11703
[3] Leighton W., Nehari Z.: On the oscillation of solutions of self-adjoint linear differential equations of the fourth order. Trans. Amer. Math. Soc, 89, 1958. DOI 10.1090/S0002-9947-1958-0102639-X | MR 0102639
[4] Regenda J.: Oscillation and nonoscillation properties of the solutions of the differential equation $y\sp{(4)}+P(t)y\sp{\prime\prime}+Q(t)y=0$. Math. Slov., 28, 1978. MR 0534812
[5] Regenda J.: Oscillation criteria for fourth order linear differential equations. Math. Slov., 29, 1979. MR 0561771 | Zbl 0408.34032
[6] Regenda J.: On the oscillation of solutions of a class of linear fourth order differential equations. Czech. Math. J., to appear in 1983. MR 0687427 | Zbl 0547.34023
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