[1] G. Grätzer, E. T. Schmidt: Ideals and congruence relations in lattices. Acta Math. Acad. Sci. Hung. 9 (1958), 137-175. DOI 10.1007/BF02023870 | MR 0100560

[2] B. Zelinka: Tolerance graphs. Comment. Math. Univ. Carol. 9 (1968), 121 - 131. MR 0232698 | Zbl 0155.51206

[3] B. Zelinka: Tolerance in algebraic structures. Czech. Math. J. 20 (1970), 179-183. MR 0260653 | Zbl 0197.01002

[4] B. Zelinka: Tolerance in algebraic structures II. Czech. Math. J. 25 (1975), 175 - 178. MR 0457323 | Zbl 0316.08001

[5] I. Chajda, B. Zelinka: Tolerance relations on lattices. Čas. pěstov. mat. 99 (1974), 394-399. MR 0360380

[6] I. Chajda, B. Zelinka: Lattices of tolerances. Čas. pěst. mat. 102 (1911), 10 - 24. MR 0450152

[7] M. A. Arbib: Tolerance automata. Kybernetika 3 (1967), 223 - 233. MR 0223185 | Zbl 0153.01201

[8] I. Chajda, B. Zelinka: Weakly associative lattices and tolerance relations. Czech. Math. J. 26 (1976), 259-269. MR 0401558 | Zbl 0332.06002

[9] I. Chajda J. Niederle, B. Zelinka: On existence conditions for compatible tolerances. Czech. Math. J. 26 (1976), 304-311. MR 0401561

[10] G. Szász: Introduction to lattice theory. Akadémiai Kiadó Budapest 1963. MR 0166118