@article{SF_1974__8_134034,
     author = {Pierre Antoine Grillet},
     title = {On regular semigroups and their multiplication.},
     journal = {Semigroup forum},
     pages = {156--163},
     publisher = {mathdoc},
     volume = {8},
     year = {1974},
     zbl = {0296.20031},
     url = {http://geodesic.mathdoc.fr/item/SF_1974__8_134034/}
}