%0 Journal Article %A Bajaj, Prem N. %T On products of semi-dynamical systems %J Archivum mathematicum %D 1972 %P 157-160 %V 8 %N 4 %U http://geodesic.mathdoc.fr/item/ARM_1972_8_4_a0/ %G en %F ARM_1972_8_4_a0