S. Murugan and G. Kumar, “Antioxidant and Free Radical Scavenging Activity in Roots of Hygrophila schulli (Buch.-Ham.) M.R.Almeida & S.M. Almeida”, Int. J. Sci. Res. Biol. Sci., vol. 5, no. 4, pp. 12–16, Aug. 2018.