Qiang, Fu, et al. “Optimization of Water Use Structure and Plantation Benefit of Unit Water Consumption Using Fractional Programming and Conditional Value-at-Risk Model”. International Journal of Agricultural and Biological Engineering, vol. 10, no. 2, Mar. 2017, pp. 151-6, https://ijabe.migration.pkpps03.publicknowledgeproject.org/index.php/ijabe/article/view/2961.