1. New properties of the equation x‴+ ax″ + bx′ + h(x) = p(t, x, x′, x″) for certain special values of the incrementary ratio y−1{h(x + y) − h(x)};Ezeilo,1973
2. Boundedness and periodicity of solutions of a certain system of third-order non-linear differential equations;Ezeilo;Ann. Mat. Pura Appl.,1966
3. n-Dimensional extensions of boundedness and stability theorems for some third-order differential equations;Ezeilo;J. Math. Anal. Appl.,1967
4. Stability Theory By Liapunov's Second Method;Yoshozawa,1966
5. Non-Linear Differential Equations Of Higher Order;Reissig,1974