Long, H., L. T. T. Huong, and T. V. Dung. “Synthesis and Characterisation of Poly (acrylamide-Co-Acrylic Acid)”. Petrovietnam Journal, Vol. 12, Dec. 2013, pp. 26-30, https://www.pvj.com.vn/index.php/TCDK/article/view/727.