1. P. J. Barry (1987): Urn Models, Recursive Curve Schemes, and Computer Aided Geometric Design, Ph.D. Dissertation, University of Utah, Salt Lake City.
2. R. H. Bartels, J. C. Beatty, B. A. Barsky (1987): An Introduction to Splines for Use in Computer Graphics and Geometric Modelling. San Mateo, CA: Kaufmann.
3. W. Boehm (1980):Inserting new knots into a B-spline. Comput. Aided Design,12:50–62.
4. W. Boehm (1983):The de Boor algorithm for triangular splines. In: Surfaces in CAGD (R. E. Barnhill, W. Boehm eds.). Amsterdam: North-Holland, pp. 109–120.
5. W. Bohem, G. Farin, J. Kahmann (1984):A survey of curve and surface methods in CAGD. Comput. Aided Geom. Design,1:1–60.