Rajput, A.P. “Studies on Vilsmeier-Haack Reaction: Preparation and Synthetic Applications of Synthones 4-Chloro-2-Arylamino Thiazole-5-Carboxaldehydes”. Asian Journal of Chemistry, vol. 16, no. 3, June 2016, pp. 1374-80, https://asianpubs.org/index.php/ajchem/article/view/14366.