Continuous or piecewise smooth dynamical systems on 2 and 3 dimensional manifolds.
Qualitative study of linear and nonlinear ordinary differential equations
Introduction to the study of limit cycles in planar dynamical systems
Ordinary Differential Equations: qualitative theory and study of models
Qualitative analysis of functional differential equations and fuzzy differential ...
Analysis of Functional Integral Equations, Generalized Ordinary Differential Equat...