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@article{SF_1994__49_2_135358, author = {R. Broeksteeg}, title = {A concept of variety for regular biordered sets.}, journal = {Semigroup forum}, pages = {335--348}, publisher = {mathdoc}, volume = {49}, number = {2}, year = {1994}, zbl = {0814.20041}, url = {http://geodesic.mathdoc.fr/item/SF_1994__49_2_135358/} }
R. Broeksteeg. A concept of variety for regular biordered sets.. Semigroup forum, Tome 49 (1994) no. 2, pp. 335-348. http://geodesic.mathdoc.fr/item/SF_1994__49_2_135358/