@InCollection{jue:05j, author = {Z. \v{S}\'{\i}r and B. J\"uttler}, editor = {R.\ Martin and H.\ Bez and M.\ Sabin}, title = {Spatial {P}ythagorean Hodograph Quintics and the Approximation of Pipe Surfaces}, booktitle = {Mathematics of Surfaces XI}, publisher = {Springer}, year = {2005}, volume= {3604}, series = {Lecture Notes in Computer Science}, pages= {364--380} }