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2

B. V. Saunders, ``A Boundary Fitted Grid Generation System for Interface Tracking,'' Numerical Grid Generation in Computational Field Simulations (B.K. Soni et al., eds.), Mississippi State University, Mississippi, 1996.

3

VRML. The Virtual Reality Modeling Language, International Standard ISO/IEC 14772-1:1997.

4

W.J. Thompson, Atlas for Computing Mathematical Functions, John Wiley and Sons, Inc., New York, 1997, pp. 414-432.

5

C. de Boor, A Practical Guide to Splines, Springer-Verlag, New York (1978).