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- Gerasin, S. N., Shlyakhov, V. V., and Yakovlev, S. V. 2008. Set coverings and tolerance relations. Cybernetics and Sys. Anal. 44, 3 (May 2008), 333–340. doi:10.1007/s10559-008-9007-y
- Hryniewiecki, K. 1991, Relations of Tolerance
 FORMALIZED MATHEMATICS, Vol. 2, No. 1, January–February 1991.
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