SHARMA , KANTI, and RENUKA JAIN. “Synthesis of Some Novel 3-[(2-Hydrazono) BenzimidazolyI]-2-Indolinone As Possible Azodyes”.
Asian Journal of Chemistry
, vol. 6, no. 2, June 2010, pp. 273-6, https://asianpubs.org/index.php/ajchem/article/view/24543.