W. Widia, E. . Ependi, A. . Amelia, C. Candra, and O. . Roanisca, “Cytotoxicity activity of ethanol extract of mentangor stem skin (Calophyllum rufigemmatum) against breast cancer cells MCF-7 in vitro: Chemistry”, J. Pijar.MIPA, vol. 18, no. 1, pp. 72–76, Jan. 2023.