Li, Bin, et al. “Measurements and Analysis of Water Content in Winter Wheat Leaf Based on Terahertz Spectroscopy”. International Journal of Agricultural and Biological Engineering, vol. 11, no. 3, June 2018, pp. 178-82, https://ijabe.migration.pkpps03.publicknowledgeproject.org/index.php/ijabe/article/view/3520.