P. Singh, C., and Archana Singh. 2010. “Synthesis and Antitumor Activity of N1-(3-Pyridoyl)- 3-Methyl-4-(Substituted Azo) Pyrazol-5-Ones ”. Asian Journal of Chemistry 1 (3):294-96. https://asianpubs.org/index.php/ajchem/article/view/25412.