Abd El-Ghaffar, M. ., & Hashem, M. (2017). Grafted Pectin with Glycidyl Methacrylate for Multi-Sites Urease Immobilization. Journal of Composites and Biodegradable Polymers, 5(2), 62–73. https://doi.org/10.12974/2311-8717.2017.05.02.4