Mai Van Bay, Le Thi Kim Bong, Vo Thang Nguyen, Doan Van Quan, and Vo Van Quan, “SUBSTITUENT EFFECTS ON THE ANTIOXIDANT ACTIVITY OF MONOSUBSTITUTED 3,3’-DIINDOLYLMETHANE: A DFT STUDY”, jshe, vol. 9, no. 5, pp. 1-8, Dec. 2019.