General moment invariants for linear Hamiltonian systems.

@article{Dragt1992GeneralMI,
  title={General moment invariants for linear Hamiltonian systems.},
  author={Dragt and Neri and Rangarajan},
  journal={Physical review. A, Atomic, molecular, and optical physics},
  year={1992},
  volume={45 4},
  pages={2572-2585}
}