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The support of the National Science Foundation under Grant DCR-86-03723 is gratefully acknowledged, as is the help of Barbara Bull in preparing this paper.
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Rosenfeld, A., Melter, R.A. Digital geometry. The Mathematical Intelligencer 11, 69–72 (1989). https://doi.org/10.1007/BF03025195
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DOI: https://doi.org/10.1007/BF03025195