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@article{SF_1980__20_134400, author = {M.B. Szendrei}, title = {On a pull-back diagram for orthodox semigroups.}, journal = {Semigroup forum}, pages = {1--10}, publisher = {mathdoc}, volume = {20}, year = {1980}, zbl = {0438.20046}, url = {http://geodesic.mathdoc.fr/item/SF_1980__20_134400/} }
M.B. Szendrei. On a pull-back diagram for orthodox semigroups.. Semigroup forum, Tome 20 (1980), pp. 1-10. http://geodesic.mathdoc.fr/item/SF_1980__20_134400/