Concepts from Tensor Analysis and Differential Geometry by Tracy Y Thomas

Calculus Revisited

Transmutation and Operator Differential Equations

Quadratic Form Theory and Differential Equations

Functional Analysis and Linear Control Theory

Observers for Linear Systems

Theory of Multiobjective Optimization

Stability and Periodic Solutions of Ordinary and Functional Differential Equations

Stability of Functional Differential Equations

Theory of Difference Equations Numerical Methods and Applications by V Lakshmikantham and D Trigiante

Variational Methods in Nonconservative Phenomena