Iranian Mathematical Society (IMS) Bulletin of the Iranian Mathematical Society 1017-060X 37 No. 4 2011 12 15 On module extension Banach algebras171 183 en A. Medghalchi H. Pourmahmood-Aghababa 2009 09 02 Module extension Banach algebras Biflatness Biprojectivity Weak amenability Automatic continuity