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MR1447246 (98b:05034) Edelsbrunner, Herbert; Waupotitsch, Roman A combinatorial approach to cartograms. 11th ACM Symposium on Computational Geometry (Vancouver, BC, 1995). Comput. Geom. 7 (1997), no. 5-6, 343--360. (Reviewer: Sandra L. Arlinghaus) 05B99