1. Blomgren RM. B-spline curves, Class Notes, Boeing Document B-7150-BB-WP-281/D-441.2, 1981.
2. An offset spline approximation for plane cubic splines;Klass;Computer-Aided Design,1983
3. Offsets of two-dimensional profiles;Tiller;IEEE Computer Graphics and Applications,1984
4. Cobb ES. Design of sculptured surfaces using the B-spline representation, PhD Thesis, University of Utah, 1984.
5. Offset curves in the plane;Hoscheck;Computer-Aided Design,1985