Ibrahim, A. S. S., A. A. Al-Salamah, A. M. El-Toni, M. A. El-Tayeb, and Y. B. Elbadawi. “Immobilization of Cyclodextrin Glucanotransferase on Aminopropyl-Functionalized Silica-Coated Superparamagnetic Nanoparticles”. Electronic Journal of Biotechnology, vol. 16, no. 6, Nov. 2013, https://www.ejbiotechnology.info/index.php/ejbiotechnology/article/view/v16n6-8.