Finite quadric segments with four conic boundary curves. - Gerhard Geise; Uwe Langbecker (Comput. Aided Geom. Des., 1990)

A geometrical approach to curvature continuous joints of rational curves. - Gerhard Geise; Bert Jüttler (Comput. Aided Geom. Des., 1993)

Béézier representation of conics of contact in the projective plane. - Gerhard Geise; Th. Nestler (Comput. Aided Geom. Des., 1994)