Journal, B.S. 2010. Hypercyclictty and Countable Hypercyclicity for Adjoint of Operators: Buthainah A. Ahmed | Hiba F. Al-Janaby. مجلة بغداد للعلوم. 7, 1 (2010), 191-199. DOI:https://doi.org/10.21123/bsj.2010.7.1.191-199.