== Resurse utile ==

* HNBody Symplectic Integration Package 

http://janus.astro.umd.edu/HNBody/

* NBI - Numerical integrators for the gravitational N-body problem 

http://www.astrobiology.ucla.edu/~varadi/NBI/NBI.html

* REDUCTION OF ROUND-OFF ERROR IN SYMPLECTIC INTEGRATORS

http://www.iop.org/EJ/article/1538-3881/121/3/1768/200204.text.html#df3

* Symplectic Integration without Roundoff Error

http://arxiv.org/abs/astro-ph/9408024

* Symplectic Integrators: Rotations and Roundoff Errors

http://www.springerlink.com/content/kn6m2034852485q3/

* A Class of Symplectic Integrators with Adaptive Time Step for Separable Hamiltonian Systems

http://www.iop.org/EJ/abstract/1538-3881/118/5/2532

* SYMPLECTIC INTEGRATOR ALGORITHMS FOR MODELING PLANETARY ACCRETION IN BINARY STAR SYSTEMS

http://www.iop.org/EJ/article/1538-3881/123/5/2884/201483.web.pdf?request-id=9233c2b4-369e-4f28-bb44-6b78981a8d25

* Symplectic Integrator

http://en.wikipedia.org/wiki/Symplectic_integrator

* Hamiltonian mechanics

http://en.wikipedia.org/wiki/Hamiltonian_mechanics

* Symplectic integrator definition

http://en.wikipedia.org/wiki/Symplectic_integrator

* Construction of higher order symplectic integrators

* Gravitational N-Body Simulation