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Additional information
The study has received financial support from the Russian Foundation of Basic Research (grant 95-01-00156).
Translated from Kibernetika i Sistemnyi Analiz, No. 3, pp. 104–116, May–June, 1998.
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Dudov, S.I. Concave and convex approximations of the distance function. Cybern Syst Anal 34, 409–420 (1998). https://doi.org/10.1007/BF02666982
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DOI: https://doi.org/10.1007/BF02666982