TY  - JOUR
AU  - Baayen, Cor P.
AU  - Hedrlín, Zdeněk
TI  - On the product and sum of a system of transformation semigroups
JO  - Commentationes Mathematicae Universitatis Carolinae
PY  - 1963
SP  - 29
EP  - 42
VL  - 04
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/CMUC_1963__4_1_a3/
LA  - en
ID  - CMUC_1963__4_1_a3
ER  -