Haijun, Liu, Li Yan, Zhang Ruihao, and Huang Guanhua. “Evaluation and Modification of Potential Evapotranspiration Methods in Beijing, China”. International Journal of Agricultural and Biological Engineering 6, no. 4 (December 25, 2013): 9–18. Accessed April 5, 2026. https://ijabe.org/index.php/ijabe/article/view/893.