ARJMANDFAR, HAMID, et al. “One-Pot Stereoselective Synthesis of Dimethyl-(Z)-2- (ethanimidoylsulfanyl)-2-Butenedioate from Dimethyl Acetylendicarboxylate and Thioacetamide in Presence of Zinc Oxide Powder”. Asian Journal of Chemistry, vol. 19, no. 2, Mar. 2010, pp. 1573-4, https://asianpubs.org/index.php/ajchem/article/view/20349.