@misc{Reich2008,
  author    = {Sebastian Reich},
  title     = {Momentum conserving symplectic integrators},
  institution = {Institut f{\"u}r Mathematik},
  series    = {Zweitver{\"o}ffentlichungen der Universit{\"a}t Potsdam : Mathematisch-Naturwissenschaftliche Reihe},
  number    = {paper 044},
  type      = {postprint},
  year        = {2008},
}