@article{GDZPPN001259512,
title = {On the word problem for free bands of groups and for free objects in some other varieties of completely regular semigroups.},
journal = {Semigroup forum},
volume = {38},
year = {1989},
pages = {1-56},
zbl = {0661.20037},
url = {http://dml.mathdoc.fr/item/GDZPPN001259512}
}
Kadourek, Jiri. On the word problem for free bands of groups and for free objects in some other varieties of completely regular semigroups.. Semigroup forum, Tome 38 (1989) pp. 1-56. http://gdmltest.u-ga.fr/item/GDZPPN001259512/