H. Chiyokura, Solid modelling with DESIGNBASE: Theory and implementation, 1988.

T. Derose and S. Mann, An approximately G 1 cubic surface interpolant Mathematical methods in computer aided geometric design II, pp.185-96, 1992.

P. Elsas and J. Vergeest, Fast approximate G 1 surface blending to support interactive sculptured feature design Product modelling for computer-integrated design and manufacture, pp.149-61, 1997.

J. Hahn, Filling polygonal holes with rectangular patches Theory and practice of geometric modelling, pp.81-91, 1989.

K. Hsuandd and M. Tsay, Corner blending of free-form n-sided holes, IEEE Computer Graphics and Applications, vol.18, issue.1, pp.72-80, 1998.

W. Hwang and J. Chuang, N -sided hole filling and vertex blending using subdivision surfaces, Journal of Information Science and Engineering, vol.19, issue.5, pp.857-79, 2003.

E. Lee and M. Lucian, M??bius reparametrizations of rational B-splines, Computer Aided Geometric Design, vol.8, issue.3, pp.213-218, 1991.
DOI : 10.1016/0167-8396(91)90004-U

F. Lin and W. Hewitt, Expressing Coons-Gordon surfaces as nurbs, Computer-Aided Design, vol.26, issue.2, pp.145-55, 1993.
DOI : 10.1016/0010-4485(94)90035-3

D. Liu, GC 1 continuity conditions between two adjacent rational Bézier surface patches, Computer Aided Geometric Design, vol.7, pp.1-4151, 1990.
DOI : 10.1016/0167-8396(90)90027-o

N. Pferifer, 3D terrain models on the basis of a triangulation, Geowissenschaftliche Mitteilungen, 2002.

L. Piegl and W. Tiller, The NURBS book, 1997.
DOI : 10.1007/978-3-642-97385-7

L. Piegl and W. Tiller, Filling n -sided regions with NURBS patches, The Visual Computer, vol.15, issue.2, pp.77-89, 1999.
DOI : 10.1007/s003710050163

R. Sarraga, G1 interpolation of generally unrestricted cubic B??zier curves, Computer Aided Geometric Design, vol.4, issue.1-2, pp.23-39, 1986.
DOI : 10.1016/0167-8396(87)90022-7

X. Shi, T. Wang, and P. Yu, A practical construction of G1 smooth biquintic B-spline surfaces over arbitrary topology, Computer-Aided Design, vol.36, issue.5, pp.414-438, 2004.
DOI : 10.1016/S0010-4485(03)00111-8

R. Tookey and A. Ball, Approximate G1 continuous interpolation of a rectangular network of rational cubic curves, Computer-Aided Design, vol.28, issue.12, pp.933-1022, 1996.
DOI : 10.1016/0010-4485(96)00017-6

T. Varady, Survey and new results in n-sided patch generation

T. Varady and A. Rockwood, Geometric construction for setback vertex blending, Computer-Aided Design, vol.29, issue.6, pp.413-438, 1997.
DOI : 10.1016/S0010-4485(96)00070-X

. Yi-jun, His research interests are computer-aided design and computer graphics, 2000.

. Jun-hai, He received his B.S. and Ph.D. in computer science from the Tsinghua University, China, in 1996 and 2001, respectively. He held a visiting researcher position in the Department of He was a post doctoral fellow in the, His research interests include computer-aided design, computer graphics, computer animation, and software engineering, 2000.

. Jean-claude, Paul is a senior researcher at CNRS and INRIA (France), and currently visiting professor at Tsinghua University. He received his Ph.D. in Mathematics from Paris University in 1976 His research interests include Numerical Analysis, Physics-Based Modeling and Computer-Aided Design

. Jia-guang, Sun is a professor in the Department of Computer Science and Technology at Tsinghua University , China. His research interests are computer graphics, computer aided design, computer-aided manufacturing , product data management and software en- gineering