TY  - JOUR
AU  - Abrhan, Imrich
AU  - Satko, Ladislav
TI  - $r$-systems of unary algebras. I: On maximal and greatest $J$-classes of the direct product of unary algebras
JO  - Mathematica slovaca
PY  - 1994
SP  - 55
EP  - 68
VL  - 44
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MASLO_1994__44_1_a5/
LA  - en
ID  - MASLO_1994__44_1_a5
ER  -