TY  - JOUR
AU  - Rojas-Hernández, Reynaldo
TI  - $\Sigma_s$-products revisited
JO  - Commentationes Mathematicae Universitatis Carolinae
PY  - 2015
SP  - 243
EP  - 255
VL  - 56
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.14712/1213-7243.2015.122/
DO  - 10.14712/1213-7243.2015.122
LA  - en
ID  - 10_14712_1213_7243_2015_122
ER  -