@InCollection{jue:06l,
  author = 	 {M.\ Aigner and Z. \v{S}\'{\i}r and B.\ J\"uttler},
  title = 	 {Least--Squares Approximation by {P}ythagorean Hodograph Spline curves via an Evolution Process},
  booktitle = 	 {Geometric Modelling and Processing},
  publisher =	 {Springer},
  year =	 {2006},
  editor =	 {Kenji Shimada and Myung--Soo Kim},
  volume =	 {4077},
  series =	 {Lecture Notes in Computer Science},
  pages = {44--58},
}