Al-Huseini, H. A. M. “IR and Uv-Visible Study of the Thermal Stabilization for Pvc Stabilized With ( Ho,Tb and Dy ) Stearate and Synergistic Mixtures”. Ibn AL-Haitham Journal For Pure and Applied Sciences 19, no. 4 (December 30, 2017): 90–98 E. Accessed March 26, 2025. https://jih.uobaghdad.edu.iq/index.php/j/article/view/1675.