Belboukhari, N., et al. “Synthesis and Characterization of Some Derivatives of 4,5-Dimethyl-Δ4-N-Aryl-N-Ethylimidazoline-2-Thione”. Asian Journal of Chemistry, vol. 20, no. 4, Mar. 2010, pp. 2491-6, https://asianpubs.org/index.php/ajchem/article/view/12643.