@article{PSSK02,
  author      = {Przemyslaw Prusinkiewicz and 
                 Faramarz Samavati and 
                 Colin Smith and 
                 Radoslaw Karwowski},
  title       = {L-system description of subdivision curves},
  journal     = {International Journal of Shape Modeling},
  volume      = {9},
  number      = {1},
  year        = {2003},
  pages       = {41-59}
}