S. GOPALAKRISHNAN, et al. “Chemical Investigation Of The Simple Ascidian Phallusia Nigra Savigny, 1816 Of Tuticorin Coast By Gc-Ms”. International Journal of Pharma and Bio Sciences, vol. 2, no. 4, Dec. 2011, pp. 382-7, https://ijpbs.net/index.php/journal/article/view/1035.