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Conference Paper
Weibel, R., and M. Heller. "A framework for digital terrain modeling." In Proceedings of the Fourth International Symposium on Spatial Data Handling, 219-229. Zürich, Switzerland: University of Zürich, 1990.
Book Chapter
Weibel, R., and M. Heller. "Digital terrain modelling." In Geographical Information Systems, edited by D.  J. Maguire, M.  F. Goodchild and D.  W. Rhind, 269-297. Vol. 1. London: Longman, 1991.