@article{SF_1971__2_133823,
     author = {M. Yamada},
     title = {O-simple strictly regular semigroups.},
     journal = {Semigroup forum},
     pages = {154--161},
     publisher = {mathdoc},
     volume = {2},
     year = {1971},
     zbl = {0228.20052},
     url = {http://geodesic.mathdoc.fr/item/SF_1971__2_133823/}
}