SUDHIR KUMAR, P., et al. “Convenient Synthesis of 3-(2-Pyridyl)- and 8-(2-Pyridyl) Carbostyrils ”. Asian Journal of Chemistry, vol. 15, no. 1, Mar. 2010, pp. 75-78, https://asianpubs.org/index.php/ajchem/article/view/21507.