Conditions for tangent plane continuity over recursively generated B-spline surfaces. - A. A. Ball; D. J. T. Storry (ACM Trans. Graph., 1988)

Design of an n-sided surface patch from Hermite boundary data. - D. J. T. Storry; A. A. Ball (Comput. Aided Geom. Des., 1989)

An investigation of curvature variations over recursively generated B-spline surfaces. - A. A. Ball; D. J. T. Storry (ACM Trans. Graph., 1990)