TY  - JOUR
AU  - Duda, Jaromír
TI  - Principal congruence relations and principal tolerances on varieties of lattices
JO  - Mathematica slovaca
PY  - 1989
SP  - 365
EP  - 369
VL  - 39
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MASLO_1989__39_4_a2/
LA  - en
ID  - MASLO_1989__39_4_a2
ER  -