@article{SF_1972__4_133912,
     author = {P. Grillet},
     title = {Building semigroups from groups (and reduced semigroups).},
     journal = {Semigroup forum},
     pages = {327--334},
     publisher = {mathdoc},
     volume = {4},
     year = {1972},
     zbl = {0273.20044},
     url = {http://geodesic.mathdoc.fr/item/SF_1972__4_133912/}
}