Kumar, Arthanari Saravana, et al. “Phytochemical, Antioxidant, Antiviral and Cytotoxic Evaluation of Opuntia Dillenii Flowers”. Bangladesh Journal of Pharmacology, vol. 9, no. 3, Aug. 2014, pp. 351-5, doi:10.3329/bjp.v9i3.19489.