http://www.hmu.edu.vn/TiengViet/tapchiyh/Tapchi/b12-03-05.pdf
Tác giả: Nguyễn Văn Tường. TCNCYH 36 (3) - 2005, tr: 77-87
Tác giả: Nguyễn Văn Tường. TCNCYH 36 (3) - 2005, tr: 77-87
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