N. Quang Hien, H. Thanh Phong, and V. Minh Kha, “THE STUDY OF THE INTEGRATION OF THE VIETNAMESE UREA RTILIZER MARKET INTO THE INTERNATIONAL MARKET AND TIIE IMPACT OF THE LEGISLATION ON UREA PRICING IN THE DOMESTIC MARKET”, Science and Technology Development Journal, vol. 9, no. 10, pp. 71-78, Oct. 2006.