@Article{jue:11h,
  author = {T. Schulz and B. J\"uttler},
  title = {Envelope Computation by Approximate Implicitization},
  journal = {Appl. Alg. Eng. Comm. Comp.},
  volume = {22},
  pages = {265-288},
  year = {2011},
  DOI = {10.1007/s00200-011-0149-1}}