@article{SF_1993__46_1_135211,
     author = {B. Billhardt},
     title = {On a wreath product embedding  for regular semigroups.},
     journal = {Semigroup forum},
     pages = {62--72},
     year = {1993},
     volume = {46},
     number = {1},
     zbl = {0770.20025},
     url = {http://geodesic.mathdoc.fr/item/SF_1993__46_1_135211/}
}