[1] Abbot, J. C.:
Semi-boolean algebra. Matem. Vestnik 4 (1967), 177–198.
MR 0239957
[2] Chajda, I.:
Algebraic Theory of Tolerance Relations. Publ. Palacký University Olomouc 1991 (Czech Republic).
Zbl 0747.08001
[3] Chajda, I.:
Tolerances in permutable algebras. Czech. Math. J. 38 (1988), 218–225.
MR 0946289
[4] Chajda, I.:
On the existence of non-trivial tolerances in permutable algebras. Czech. Math. J. 40 (1990), 598–600.
MR 1084895 |
Zbl 0742.08002
[5] Chajda, I.:
Every at most four element algebra has a Mal’cev theory for permutability. Math. Slovaca 41 (1991), 35–39.
MR 1094982 |
Zbl 0779.08001
[6] Chajda, I., Czédli, G.:
Maltsev functions on small algebras. Studia Sci. Math. Hungarica (Budapest) 28 (1993), 339–348.
MR 1266817
[7] Chajda, I., Niederle, J., Zelinka, B.:
On the existence conditions for compatible tolerances. Czech. Math. J. 26 (1976), 304–311.
MR 0401561
[8] Chajda, I., Zelinka, B.:
Tolerances and congruences in implication algebras. Czech. Math. J. 38 (1988), 207–217.
MR 0946288
[9] Cornish, W. H.:
On Iséki’s BCK-algebras. Lectures Notes in Pure and Appl. Math. 74 (1982), New York, 101–122.
MR 0647169 |
Zbl 0486.03033
[10] Gumm, H.-P.:
Is there a Mal’cev theory for single algebras?. Algebra Univ. 8 (1978), 320–329.
MR 0472647 |
Zbl 0382.08003
[11] Mal’cev, A. I: On the general theory of algebraic systems (Russian). Matem. Sbornik 35 (1954), 3–20.
[13] Pixley, A. F.:
Distributivity and permutability of congruence relations in equational classes of algebras. Proc. Amer. Math. Soc. 14 (1963).
MR 0146104 |
Zbl 0113.24804
[14] Raftery, J. G., Rosenberg, I. G., Sturm, T.:
Tolerance relations and BCK-algebras. Math. Japon. 36 (1991).
MR 1109222
[16] Tanaka, S.:
On $\wedge $-commutative algebras. Math. Semin. Notes Kobe Univ. 3 (1975), 59–64.
MR 0419222