1. Methods of trend surface analysis;Agterberg;Q. Colo. Sch. Mines,1964
2. Interpolation of areally distributed data;Agterberg;Q. Colo. Sch. Mines,1969
3. Geomathematics;Agterberg,1974
4. A computer program for polynomial trendsurface analysis;Agterberg;Geol. Surv. Can., Paper,1975
5. Bivariate interpolation and smooth surface fitting for irregularly distributed data points;Akima;ACM Trans. Math. Software,1978