@article{NUMA_1975__25_132385,
     author = {R.A. LaBudde and D. Greenspan},
     title = {Energy and {Momentum} {Conserving} {Methods} of  {Arbitrary} {Order} for the {Numerical} {Integration} of {Equations} of {Motion.} {I.} {Motion} of a {Single} {Particle.}},
     journal = {Numerische Mathematik},
     pages = {323--346},
     publisher = {mathdoc},
     volume = {25},
     year = {1975},
     zbl = {0364.65066},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1975__25_132385/}
}