@Article{SCI:Tri2000a,
  author =    "X. Tricoche and G. Scheuermann and H. Hagen",
  title =     "Higher Order Singularities in Piecewise Linear
              Vector Fields",
  journal =   "The Mathematics of Surfaces IX",
  pages =     "99--113",
  year =      "2000",
  publisher = "Springer, London",
  url =       "http://www.sci.utah.edu/publications/tricoche00/higher.pdf",
}