1. The Theory of Splines and their Applications;Ahlberg,1967
2. A contour generator;Armbrust,1968
3. Surface determination and automatic contouring for mineral exploration, extraction and processing;Batcha;Colo. School Mines, Quart.,1964
4. The construction of isarithms and isarithmic maps by computer;Bengtsson;B.I.T.,1964
5. Bicubic splines interpolation as a method for treatment of potential field data;Bhattacharyya;Geophysics,1969