@article{SF_1989__38_2_134940,
     author = {Jiri Kadourek},
     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},
     pages = {1--56},
     publisher = {mathdoc},
     volume = {38},
     number = {2},
     year = {1989},
     zbl = {0661.20037},
     url = {http://geodesic.mathdoc.fr/item/SF_1989__38_2_134940/}
}