Iranian Mathematical Society (IMS) Bulletin of the Iranian Mathematical Society 1017-060X 38 2 2012 07 15 Some homological properties of amalgamated duplication of a ring along an ideal507 515 en Mohamed Chhiti University of Fez, Fez, Morocco Najib Mahdou Department of Mathematics, Faculty of Sciences and Technology, University of Fez, Fez, Morocco. 2010 10 17 Amalgamated Perfect ring (n d)-ring