Krishna Mohan, S., Srivastava, T., & Govindarajan, K. (2011). Development of Foam Indicator Based on Cationic Surfactant Quaternized Fatty Acid Triethanolamine Ester. Asian Journal of Chemistry, 23(6), 2688–2690. Retrieved from https://asianpubs.org/index.php/ajchem/article/view/10434