@Article{SCI:Bar2004b,
  author =    "S.G. Bardenhagen and E.M. Kober",
  title =     "The Generalized Interpolation Material Point
              Method",
  journal =   "Computer Modeling in Engineering and Sciences",
  volume =    "5",
  number =    "6",
  pages =     "477--495",
  year =      "2004",
  url =       "http://www.sci.utah.edu/publications/Bar2004b/2004_Bardenhagen_Kober_Generalized_Interpolation_Material_Point_Method.pdf",
}