@article{SF_1985__31_134737,
     author = {A. Batbedat},
     title = {Les {F-R\'eguliers} \`a gauche (left {F-Regular} semigroups).},
     journal = {Semigroup forum},
     pages = {69--86},
     publisher = {mathdoc},
     volume = {31},
     year = {1985},
     zbl = {0549.20043},
     url = {http://geodesic.mathdoc.fr/item/SF_1985__31_134737/}
}