Structure-Preserving Algorithms for Oscillatory Differential Equations by Wu

Structure-Preserving Algorithms for Oscillatory Differential Equations, Hardc...

Geometric Numerical Integration: Structure-Preserving Algorithms for ...

Intro to Ordinary Differential Equations by Coddington (1964, Vintage Textbook)

Elementary Differential Equations with Boundary Value Problems by C. Henry...

Implementing Spectral Methods for Partial Differential Equations: Algorithms for

Recent Developments in Structure-Preserving Algorithms for Oscillatory Different