Yu, Fenghua, et al. “Method for the Hyperspectral Inversion of the Phosphorus Content of Rice Leaves in Cold Northern China”. International Journal of Agricultural and Biological Engineering, vol. 17, no. 6, Dec. 2024, pp. 256-63, https://ijabe.migration.pkpps03.publicknowledgeproject.org/index.php/ijabe/article/view/8464.