@article{SF_1978__16_134280,
     author = {D. Allouch},
     title = {Extensions de demi-groupe inverses.},
     journal = {Semigroup forum},
     pages = {111--116},
     publisher = {mathdoc},
     volume = {16},
     year = {1978},
     zbl = {0384.20044},
     url = {http://geodesic.mathdoc.fr/item/SF_1978__16_134280/}
}