@Article{jue:11g,
  author =  {B. Bastl and B. J\"uttler and M. L\'avi\v{c}ka and T. Schulz},
  title =   {Blends of canal surfaces from polyhedral medial 
             transform representations},
  journal = {Computer-Aided Design},
  volume =  {43},
  year =    {2011},
  pages =   {1477-1484},
  DOI = {10.1016/j.cad.2011.08.014}}