TY  - JOUR
AU  - Raftery, J. G.
AU  - Sturm, T.
TI  - Tolerance numbers, congruence $n$-permutability and BCK-algebras
JO  - Czechoslovak Mathematical Journal
PY  - 1992
SP  - 727
EP  - 740
VL  - 42
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1992.128368/
DO  - 10.21136/CMJ.1992.128368
LA  - en
ID  - 10_21136_CMJ_1992_128368
ER  -