N. Huu Nieu, N. Dac Thanh, L. Thai Ha, and N. Quoc Viet, “BISMALEIMIDE BASED ON 4,4’ - DIAMINODIPHENYL MATHANE (DDM) ANHYDRIDE MALEIC (AM) WAS MODIFIED WITH DDM”, Science and Technology Development Journal, vol. 10, no. 2, pp. 29-36, Feb. 2007.