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@article{SF_1993__47_2_135266, author = {M.V. Lawson}, title = {Congruences on ordered groupoids.}, journal = {Semigroup forum}, pages = {150--167}, publisher = {mathdoc}, volume = {47}, number = {2}, year = {1993}, zbl = {0790.06015}, url = {http://geodesic.mathdoc.fr/item/SF_1993__47_2_135266/} }
M.V. Lawson. Congruences on ordered groupoids.. Semigroup forum, Tome 47 (1993) no. 2, pp. 150-167. http://geodesic.mathdoc.fr/item/SF_1993__47_2_135266/