Abdel-Rahman, R.M., and M.M. Fawzy. “Some Addition Reactions of 3-Arylidene-5,6-Diphenyl-1,2,4-Triazenes ”. Asian Journal of Chemistry, vol. 4, no. 3, Mar. 2010, pp. 621-8, https://asianpubs.org/index.php/ajchem/article/view/25104.