@article{104926,
author = {Cor P. Baayen and Zden\v ek Hedrl\'\i n},
title = {On the product and sum of a system of transformation semigroups},
journal = {Commentationes Mathematicae Universitatis Carolinae},
volume = {004},
year = {1963},
pages = {29-42},
zbl = {0116.25601},
mrnumber = {0159895},
language = {en},
url = {http://dml.mathdoc.fr/item/104926}
}
Baayen, Cor P.; Hedrlín, Zdeněk. On the product and sum of a system of transformation semigroups. Commentationes Mathematicae Universitatis Carolinae, Tome 004 (1963) pp. 29-42. http://gdmltest.u-ga.fr/item/104926/
Two theorems concerning common fixed points of commutative mappings, CMUC, 3, 2 (1962). (1962) | MR 0159896