Xue, Jinru, et al. “Automated Chinese Medicinal Plants Classification Based on Machine Learning Using Leaf Morpho-Colorimetry, Fractal Dimension and Visible Near Infrared Spectroscopy”. International Journal of Agricultural and Biological Engineering, vol. 12, no. 2, Apr. 2019, pp. 123-31, https://ijabe.migration.pkpps03.publicknowledgeproject.org/index.php/ijabe/article/view/4637.