Guerra, Rocío, et al. “Analgesic Effect, Phytochemical Characterization and Toxicological Analysis of Ethanolic Extract of Pereskia Lychnidiflora Leaves”. Revista Peruana De Medicina Experimental Y Salud Pública, vol. 35, no. 4, Dec. 2018, pp. 581-9, https://doi.org/10.17843/rpmesp.2018.354.3532.