... a-AMYRIN TLf CAY CUM RUM RANG Den Tda soan 23-5-2008 TRAN VAN SUNG, NGUYEN HUY CUONG, PHAM THI NINH, TRINH THI THUY Vien Hod hgc, Vien Khoa hgc vd Cong nghe Viet Nam ABSTRACT A mixture of three ... ca toan qud'c lin thii 3, 375 - 379 (2005). 5. Nguyin Xuan Cudng, Phan Van Kiem, Chau Van Minh, Mai Dinh Tri, Nguyin Cdng Hao, Vii Manh Hiing, Nguyen Huy Thii. Tuyen tap cae cdng ... cdng trinh Hgi nghi Khoa hgc va Cdng nghe Hoa hull ca toan qud'c lin thii 3, 257 - 260 (2005). 6. Trinh Thi Thuy, Nguyen Huy Cuong, Tran Van Sung. Tap chi Hoi hgc, 45 (2), 228 -232(2007)....