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@article{SF_1974__6_133968, author = {M. Yamada}, title = {Orthodox semigroups whose idempotents satisfy a certain identity.}, journal = {Semigroup forum}, pages = {113--128}, publisher = {mathdoc}, volume = {6}, year = {1974}, zbl = {0255.20038}, url = {http://geodesic.mathdoc.fr/item/SF_1974__6_133968/} }
M. Yamada. Orthodox semigroups whose idempotents satisfy a certain identity.. Semigroup forum, Tome 6 (1974), pp. 113-128. http://geodesic.mathdoc.fr/item/SF_1974__6_133968/