“Synthesis and Optical Properties Study of Some Metal Complexes of Poly (Vinyl Chloride)-Pyridine-4-Carbohydrazide”, ANJS, vol. 16, no. 2, pp. 24–29, Jul. 2018, Accessed: Nov. 02, 2024. [Online]. Available: https://mail.anjs.edu.iq/index.php/anjs/article/view/660