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@article{SF_1984__29_134693, author = {S. Armstrong}, title = {The structure of type {A} semigroups.}, journal = {Semigroup forum}, pages = {319--336}, publisher = {mathdoc}, volume = {29}, year = {1984}, zbl = {0546.20057}, url = {http://geodesic.mathdoc.fr/item/SF_1984__29_134693/} }
S. Armstrong. The structure of type A semigroups.. Semigroup forum, Tome 29 (1984), pp. 319-336. http://geodesic.mathdoc.fr/item/SF_1984__29_134693/