@InCollection{jue:00g,
  author = 	 {B. J\"uttler},
  title = 	 {Least--squares fitting of algebraic spline curves via normal vector estimation},
  booktitle = 	 {The Mathematics of Surfaces IX},
  pages =	 {263--280},
  publisher =	 {Springer},
  year =	{2000},
  editor =	 {R. Cipolla and R.R Martin},
  address =	 {London}
}