M. Y. Abdelfattah, H. A.-H. Sherif, H. A. Dameer, W. Abouzid, and Z.-J. Liu, “Effects of Botulinum Toxin A on Histology and Ultrastructure of Submandibular Salivary Gland in Rats”,  J. Dentists, vol. 5, no. 1, pp. 28–35, Feb. 2017.