@article{SF_1989__38_2_134960,
     author = {Peter R. Jones},
     title = {Varieties generated by free completely simple semigroups.},
     journal = {Semigroup forum},
     pages = {269--282},
     publisher = {mathdoc},
     volume = {38},
     number = {2},
     year = {1989},
     zbl = {0663.20064},
     url = {http://geodesic.mathdoc.fr/item/SF_1989__38_2_134960/}
}