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@article{SF_1974__9_134081, author = {Ki-Hang, Kim Butler}, title = {The semigroup of {Hall} relations.}, journal = {Semigroup forum}, pages = {253--260}, publisher = {mathdoc}, volume = {9}, year = {1974}, zbl = {0292.20061}, url = {http://geodesic.mathdoc.fr/item/SF_1974__9_134081/} }
Ki-Hang, Kim Butler. The semigroup of Hall relations.. Semigroup forum, Tome 9 (1974), pp. 253-260. http://geodesic.mathdoc.fr/item/SF_1974__9_134081/