An algebraic approach to curves and surfaces on the sphere and on other quadrics. - Roland Dietz; Josef Hoschek; Bert Jüttler (Comput. Aided Geom. Des., 1993)

Rational patches on quadric surfaces. - Roland Dietz; Josef Hoschek; Bert Jüttler (Comput. Aided Des., 1995)

Rationale Bézier-Kurven und Bézier-Flächenstücke auf Quadriken. - Roland Dietz (Shaker, 1995)