K.J. Versprille
"Computer-Aided Design Applications of the Rational B-spline
Approximation Form"
Ph.D dissertation, Dept. of Systems and Informations Science, Syracuse
University, Syracuse, New York, May 1975

C. De Boor
"A Practical Guide to Splines"
Applied Mathematical Science vol 27, Springer Verlag, New York, 1978

Ferrari, Silbermann, Sankar
"Efficient curve and surface generation using high order differencing"
Conf. on curves and surfaces in Computer Vision and Graphics,
Electronic Imaging, Santa Clara, February 1990

Gordon, Riesenfeld
"B-Spline Curves and Surfaces"
in Barnhill, Riesenfeld: "Computer Aided Geometric Design", Academic
Press, New York, 1974, pp95-126
(convex hull ppty)