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[1] I. Chajda J. Duda: Blocks of binary relations. Acta Math. Acad. Sci. Hungar. (to appear). MR 0588416
[2] I. Chajda J. Niederle B. Zelinka: On existence conditions for compatible tolerances. Czech. Math. J. 26 (1976), 304-311. MR 0401561
[3] I. Chajda B. Zelinka: Lattices of tolerances. Časop. pěst. mat. 102 (1977), 10-24. MR 0450152
[4] J. Duda I. Chajda B. Zelinka: On the structure of compatible relations. Czech. Math. J. (to appear).
[5] G. Grätzer: Universal Algebra. New York 1968. MR 0248066
[6] G. Szász: Introduction to Lattice Theory. Budapest 1963. MR 0166118
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