Said, S. A. “Preparation and Nucleophilic Substitution of the 2,4,6-Triphenylpyridinium Salts, Diazonium Intermediates and N,N-1,2-Benzenedisulfonylimides of Chiral Amino Acids”. Tanzania Journal of Science, vol. 33, no. 1, Apr. 2021, pp. 9-18, https://tjs.udsm.ac.tz/index.php/tjs/article/view/340.