Iranian Mathematical Society (IMS) Bulletin of the Iranian Mathematical Society 1017-060X Articles in Press 2011 02 28 Extensions of strongly a-reversible rings en Liang Zhao Department of Mathematics, Nanjing University, Nanjing, 210093, China Xiaosheng Zhu Department of Mathematics, Nanjing University, Nanjing, 210093, China 2011 02 27 reversible rings strongly a-reversible rings Nil-a-reversible rings weakly reversible rings