T. M. Fakih, D. S. F. Ramadhan, and F. Darusman, “In Silico Activity Identification of Cyclo Peptide Alkaloids from Zizyphus Spina-Christi Species Against Sars-Cov-2 Main Protease”, Jurnal Biodjati, vol. 6, no. 1, pp. 71–81, Jun. 2021.