@article{SF_1991__42_3_251462,
     author = {J. Justin and G. Pirillo},
     title = {Corrigendum to },
     journal = {Semigroup forum},
     pages = {125--126},
     publisher = {mathdoc},
     volume = {42},
     number = {3},
     year = {1991},
     zbl = {0714.20050},
     url = {http://geodesic.mathdoc.fr/item/SF_1991__42_3_251462/}
}