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@article{SF_1974__9_134080, author = {D.E. Zitarelli}, title = {Compatible extensions and subdirectly irreducible inverse semigroups.}, journal = {Semigroup forum}, pages = {241--252}, publisher = {mathdoc}, volume = {9}, year = {1974}, zbl = {0292.20057}, url = {http://geodesic.mathdoc.fr/item/SF_1974__9_134080/} }
D.E. Zitarelli. Compatible extensions and subdirectly irreducible inverse semigroups.. Semigroup forum, Tome 9 (1974), pp. 241-252. http://geodesic.mathdoc.fr/item/SF_1974__9_134080/