[1] P. Crawley R. P. Dilworth: Algebraic theory of lattices. Рrentice-Hall, Englewood Cliffs, N.J. 1973.

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

[3] J. Chajda B. Zelinka: Minimal compatible toleгances on lattices. Czech. Math. Ј. 27 (1977), 452-459. MR 0457300

[4] J. Niederle: Relative bicomplements and tolerance extension property in distributive lattices. Čas. pěst. mat. 103 (1978), 250-254. MR 0505926 | Zbl 0393.06005