1. The digital terrain model — theory and applications;Miller;Photogrammetric Eng.,1958
2. Progressive sampling for digital terrain models;Makarovic;ITC J.,1973
3. Amended strategy for progressive sampling;Makarovic;ITC J.,1975
4. Composite sampling for DTMs';Makarovic;ITC J.,1977
5. HIFI — a minicomputer program package for height interpolation by finite elements;Ebner,1980