1. Some remarks on the existence of periodic solutions;Antosiewicz,1979
2. Nonlinear oscillations in the frame of alternative methods;Cesari,1976
3. Dichotomies and reducibility, II;Coppel;J. Differential Equations,1968
4. Integral Equations and Stability of Feedback Systems;Corduneanu,1973
5. Equations with bounded nonlinearities;Cronin;J. Differential Equations,1973