@Article{jue:14o,
  author =   {B. Bastl and B. J\"uttler and M. L\'avicka and T. Schulz 
              and Z. \v{S}\'{\i}r},
  journal =  {Mathematics in Computer Science},
  title =    {On the parameterization of rational ringed surfaces and 
              rational canal surfaces},
  year =     {2014},
  volume =   {8},
  pages =    {299-319},
  doi =      {10.1007/s11786-014-0192-y}
}