[1] C. K. Chui, J. Hanisch, M.J. Lai, J.-A. Lian, and P. F. Cassidy, ``Smoothing and Gap Removal of Compound C¹ Cubic NURBS Surface Patches,'' Proceedings of the 1998 NSF Design and Manufacturing Grantees Conference, Monterrey, Mexico, pp.181--182, 1998.

[2] C. K. Chui, J. Hanisch, M.J. Lai, J.-A. Lian, and P. F. Cassidy, ``Removal of Gaps among Compound C¹ Bi-cubic B-spline Surface Patches,'' March, 1998, submitted.

[3] D. Liu and J. Hoschek, GC¹ continuity conditions between adjacent rectangular and triangular Bezier surface patches, Comput. Aid Design, 21(1989), pp. 194--200.

[4] L. Piegal and W. Tiller, The NURBS Book, Springer Verlag, Berlin, 1995.