@article{SF_1985__31_134741,
     author = {N. Kehayopulu},
     title = {On left (resp. right) duo regular poesemigroups.},
     journal = {Semigroup forum},
     pages = {123--126},
     year = {1985},
     volume = {31},
     zbl = {0549.06008},
     url = {http://geodesic.mathdoc.fr/item/SF_1985__31_134741/}
}