Mohammed Ahmed Kareem, Zainab Abduljabar Hussain, Tagreed Abduljabar, Nora Sahib, and hyfa muhssen Bander. “Effect of Benzyl Adenine ( BA) on In Vitro Initiation of Pear Pyrus Communis L and Apple Malus Domestica Borkh Rootstocks ”. Journal of Madenat Alelem University College, Vol. 6, no. 2, Dec. 2014, pp. 64-72, http://116.203.176.164/index.php/JMAUC/article/view/178.