Al-Issa, Mahmoud A., Ayat A. Abbas, and Fadhel S. Matty. 2017. “Synthesis and Characterization of Schiff Base Derived From Chitosan and Its Complexes With (Co+2, Ni+2 and Cu+2)”. Ibn AL-Haitham Journal For Pure and Applied Sciences 29 (2): 115-29. https://jih.uobaghdad.edu.iq/index.php/j/article/view/90.