1. Recent results on oscillation of solutions of forced and perturbed nonlinear differential equations of even order;Kartsatos,1977
2. Oscillation of nth order equations with perturbations;Kartsatos;J. Math. Anal. Appl.,1977
3. Oscillation and nonoscillation for perturbed differential equations;Kartsatos;Hiroshima Math. J.,1978
4. Inequalities;Hardy,1988
5. Nonoscillatory solutions of higher order delay differential equations;Foster;J. Math. Anal. Appl.,1980