Pitagan, Paolo Angelo, et al. “Phytoremediation of Lead, Arsenic and Chromium Polluted Soil Using Opuntia Spp. (Dilang-Baka)”. BIODIVERS - BIOTROP Science Magazine, vol. 2, no. 2, Oct. 2023, pp. 38-45, doi:10.56060/bdv.2023.2.2.2095.