Geodesic
Oscillation Theorems for Second Order Sublinear Ordinary Differential Equations
Serdica Mathematical Journal, Tome 23 (1997) no. 3-4, pp. 243-254.

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Oscillation criteria are given for the second order sublinear non-autonomous differential equation. (r(t) (x)x′(t))′ + q(t)g(x(t)) = (t). These criteria extends and improves earlier oscillation criteria of Kamenev, Kura, Philos and Wong. Oscillation criteria are also given for second order sublinear damped non-autonomous differential equations.
Keywords: Second Order Differential Equation, Oscillation 
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     author = {Elabbasy, E.},
     title = {Oscillation {Theorems} for {Second} {Order} {Sublinear} {Ordinary} {Differential} {Equations}},
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Elabbasy, E. Oscillation Theorems for Second Order Sublinear Ordinary Differential Equations. Serdica Mathematical Journal, Tome 23 (1997) no. 3-4, pp. 243-254. http://geodesic.mathdoc.fr/item/SMJ2_1997_23_3-4_a5/