Falguni Sheth, and Subrata De. “Evaluation of Comparative Antioxidant Potential of Four Cultivars of Hibiscus Rosa-Sinensis L. By HPLC-DPPH Method”. Free Radicals and Antioxidants, vol. 2, no. 4, Dec. 2012, pp. 73-78, doi:10.5530/ax.2012.4.13.