@article{SF_1971__2_133815,
     author = {T.E. Hall},
     title = {On bands, free bands and identities.},
     journal = {Semigroup forum},
     pages = {83--84},
     publisher = {mathdoc},
     volume = {2},
     year = {1971},
     zbl = {0232.20113},
     url = {http://geodesic.mathdoc.fr/item/SF_1971__2_133815/}
}