1. Oscillation Theory of Second Order Linear, Half-Linear, Superlinear and Sublinear Dynamic Equations;Agarwal,2002
2. Stability and Asymptotic Behavior of Differential Equations;Coppel,1965
3. Qualitative theory of halflinear second order differential equations;Došlý;Math. Bohem.,2002
4. Half-Linear Differential Equations;Došlý,2005
5. Oscillation and nonoscillation theorems for some nonlinear differential equations;Elbert,1982