@article {mclachlan_quispel_robidoux98,
    AUTHOR = {McLachlan, Robert I. and Quispel, G. R. W. and Robidoux,
              Nicolas},
     TITLE = {Unified approach to {H}amiltonian systems, {P}oisson systems,
              gradient systems, and systems with {L}yapunov functions or
              first integrals},
   JOURNAL = {Phys. Rev. Lett.},
  FJOURNAL = {Physical Review Letters},
    VOLUME = {81},
      YEAR = {1998},
    NUMBER = {12},
     PAGES = {2399--2403},
      ISSN = {0031-9007},
     CODEN = {PRLTAO},
   MRCLASS = {58F05 (34A34)},
  MRNUMBER = {99f:58079},
}