TY  - JOUR
AU  - Chajda, Ivan
AU  - Rachůnek, Jiří
TI  - Relational characterizations of permutable and $n$-permutable varieties
JO  - Czechoslovak Mathematical Journal
PY  - 1983
SP  - 505
EP  - 508
VL  - 33
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1983.101905/
DO  - 10.21136/CMJ.1983.101905
LA  - en
ID  - 10_21136_CMJ_1983_101905
ER  -