Marwan Manhal Awad, M. T. Ahmadi, Hisham Mohammed Ali Hasan. “Cold Plasma Surface and Linear/Nonlinear Optical Properties of Poly (Acrylic Acid-Co-Methyl Methacrylate) Hydrogel Film”. The International Journal of Multiphysics, vol. 18, no. 3, Oct. 2024, pp. 1682 -89, https://www.themultiphysicsjournal.com/index.php/ijm/article/view/1480.