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