@article{SF_1981__23_134505,
     author = {N. Kehayopulu},
     title = {A characterization of regular le-semigroups.},
     journal = {Semigroup forum},
     pages = {85--86},
     publisher = {mathdoc},
     volume = {23},
     year = {1981},
     zbl = {0467.06010},
     url = {http://geodesic.mathdoc.fr/item/SF_1981__23_134505/}
}