N. T. Phuong, N. T. Chinh, V. Q. Manh, T. Hoang, and V. Q. Trung, “Some characteristics and allopurinol release of carrageenan/ allopurinol films using polyethylene oxide as a dispersion aid agent”, Vietnam J. Sci. Technol., vol. 58, no. 2, pp. 219–227, Mar. 2020.