3D reconstruction of closed objects by piecewise cubic Bézier patches
C. Cottin, R. van Damme, in: D.C. Handscomb (Ed.), The Mathematics of Surfaces III, Proc. Conf. Bath 1990, Oxford University Press, 1990.

Mixed K-functionals: A measure of smoothness for blending-type approximation
C. Cottin, Mathematische Zeitschrift 204 (1990) 69–83.