1. Hiroshi Akima, (1975), A method of bivariate interpolation and smooth surface fitting for values given at irregularly distributed points, U.S. Depart. of Commerce OT Report 75–70. An improved version of this algorithm will appear in ACM TOMS.
2. Robert E. Barnhill, (1977), Representation and approximation of surfaces, this volume, pp. 68–119.
3. Reproducing kernel functions for Sard spaces of type B;Barnhill;SIAM J. Numer. Anal.,1974
4. Construction of isarithms and isarithmic maps by computers;Bengtsson;BIT,1964
5. Compatible triangular finite elements;Birkhoff;Jour. Math. Anal. Appl.,1974