TY - JOUR AU - D.E. Zitarelli TI - Compatible extensions and subdirectly irreducible inverse semigroups. JO - Semigroup forum PY - 1974 SP - 241 EP - 252 VL - 9 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/SF_1974__9_134080/ ID - SF_1974__9_134080 ER -