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 developed by K.K. Kemp and A.U. Frank with assistance from members of the Department of Geoinformation at the Technical University of Vienna. To be published in the International Journal of Geographical Information Systems, 1996.
 Originally drafted by M.F. Goodchild and revised by R.F. Dodson, K.K. Kemp and S.D. Palladino for The NCGIA guide to laboratory material, Technical report 91-20, National Center for Geographic Information and Analysis, University of California, Santa Barbara, CA (1991).