TY - JOUR AU - Lallement, Gérard AU - Petrich, Mario TI - Extensions of a Brandt Semigroup by Another JO - Canadian journal of mathematics PY - 1970 SP - 974 EP - 983 VL - 22 IS - 5 UR - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1970-111-1/ DO - 10.4153/CJM-1970-111-1 ID - 10_4153_CJM_1970_111_1 ER -