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@article{SF_1989__38_2_134946, author = {Thomas E. Nordahl}, title = {Separative {P.I.} semigroups are embeddable into a semilattice of groups.}, journal = {Semigroup forum}, pages = {119--122}, publisher = {mathdoc}, volume = {38}, number = {2}, year = {1989}, zbl = {0657.20048}, url = {http://geodesic.mathdoc.fr/item/SF_1989__38_2_134946/} }
Thomas E. Nordahl. Separative P.I. semigroups are embeddable into a semilattice of groups.. Semigroup forum, Tome 38 (1989) no. 2, pp. 119-122. http://geodesic.mathdoc.fr/item/SF_1989__38_2_134946/