Global smoothness preservation by multivariate approximation operators
C. Anastassiou, C. Cottin, H. Gonska, in: S. Baron, D. Leviatan (Eds.), Israel Mathematical Conference Proceedings, Vol. IV, 1991, pp. 31–44.

Global smoothness of approximating functions
G.A. Anastassiou, C. Cottin, H.H. Gonska, Analysis 11 (1991).

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.

Inverse theorems for blending-type approximation
C. Cottin, in: C.K. Chui, L.L. Schumaker, J.D. Ward (Eds.), Approximation Theory VI, Proc. Conf. College Station (Texas), Academic Press, 1989, pp. 149–152.

A Korovkin-type theorem for generalizations of Boolean sum operators and approximation by trigonometric pseudopolynomials
C. Badea, I.A. Badea, C. Cottin, Revue d’Analyse Numérique et de La Théorie de l’Approximation 17 (1988) 7–17.

Quantitative Aussagen zur Blending-Typ-Approximation
C. Cottin, Quantitative Aussagen zur Blending-Typ-Approximation, 1988.

Notes on degree of approximation of B-continuous and B-differentiable functions.
C. Badea, I. Badea, C. Cottin, H.H. Gonska, Journal of Approximation Theory and Its Applications 4 (1988) 95–108.

A note on construction of preconditioners in solving 3D elliptic problems by substructuring
P.S. Vassilevski, S. Petrova, Comptes Rendus de l’Academie Bulgare Des Sciences 41 (1988) 33–36.