Investigations of different integration methods ...

References:

- Thoughts on the Velocity-Verlet (gamedev.net) (John Schultz's comments and integration method sample code in particular.)
- Stability of position-Verlet integration
- Velocity Verlet
- softmatter:Velocity Verlet Algorithm
- The leapfrog method and other "symplectic" algorithms for integrating Newtonâ€™s laws of motion