Optimal approximate conversion of spline surfaces. - Josef Hoschek; Franz-Josef Schneider; Peter Wassum (Comput. Aided Geom. Des., 1989)

Spline conversion for trimmed rational Bézier- and B-spline surfaces. - Josef Hoschek; Franz-Josef Schneider (Comput. Aided Des., 1990)

3. Approximate Spline Conversion for Integral and Rational Bézier and B-Spline Surfaces. - Josef Hoschek; Franz-Josef Schneider (Geometry Processing for Design and Manufacturing, 1992)

Interpolation, Approximation und Konvertierung mit rationalen B-Splines. - Franz-Josef Schneider (Shaker, 1993)