T. P. Huynh, T. D. Truong, T. P. Quach, N. T. V. Dao, H. M. Nguyen, and T. T. T. Nguyen, “INVESTIGATION ON CHEMICAL CONSTITUENTS OF THE LICHEN USNEA UNDULATA AND PRELIMINARY APPLICATION IN SUNSCREEN CREAM”, CTJUMP, no. 61, pp. 378–386, Jul. 2023.