Gnanasekaran, N. ., Ruban John, J. ., Sakthivel, G. . and Kalavathy, S. (2016) “The Comparative Studies of the Phytochemical Levels and the in vitro Antioxidant Activity of Tridax procumbens L. from Different Habitats”, Free Radicals and Antioxidants, 7(1), pp. 50–56. doi: 10.5530/fra.2017.1.8.