Heda, P.B., and B.J. Ghiya. “Synthesis of 2-Amino Dihydropyrimidines,Their Thiocarbamide Derivatives and Study of Their Antimicrobial Activity”. Asian Journal of Chemistry, vol. 11, no. 2, Mar. 2010, pp. 591-4, https://asianpubs.org/index.php/ajchem/article/view/23324.