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@article{SF_1990__40_1_135023, author = {R. McFadden and J.M. Howie}, title = {Ideals are greater on the left.}, journal = {Semigroup forum}, pages = {247--248}, publisher = {mathdoc}, volume = {40}, number = {1}, year = {1990}, zbl = {0692.20054}, url = {http://geodesic.mathdoc.fr/item/SF_1990__40_1_135023/} }
R. McFadden; J.M. Howie. Ideals are greater on the left.. Semigroup forum, Tome 40 (1990) no. 1, pp. 247-248. http://geodesic.mathdoc.fr/item/SF_1990__40_1_135023/