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@article{SF_1982__25_134571, author = {D.W. Hardy and M.C. Thornton}, title = {Partial orders and their semigroups of closed relations.}, journal = {Semigroup forum}, pages = {171--184}, publisher = {mathdoc}, volume = {25}, year = {1982}, zbl = {0496.20051}, url = {http://geodesic.mathdoc.fr/item/SF_1982__25_134571/} }
D.W. Hardy; M.C. Thornton. Partial orders and their semigroups of closed relations.. Semigroup forum, Tome 25 (1982), pp. 171-184. http://geodesic.mathdoc.fr/item/SF_1982__25_134571/