Dung, Ngo, Cao Ha, and Vu Xuan. 2024. “Study on Limit Factors of Soil for Orange Cultivation in Ham Yen District, Tuyen Quang Province”. Vietnam Journal of Agricultural Sciences 18 (4): 279-88. http://testtapchi.vnua.edu.vn/index.php/vjasvn/article/view/665.