P., J., K. S., C. P., and K. Y. “Nitrogen Fertilizer Recommendation for Waxy Corn Measured by Canopy Reflectance Using UAV Imaging Passive Sensor”. International Journal of Geoinformatics, vol. 16, no. 3, Sept. 2020, pp. 71-86, https://journals.sfu.ca/ijg/index.php/journal/article/view/1781.