Wahiddin, Deden, et al. “Color Feature Extraction and Euclidean Distance for Classification of Oryza Sativa Nitrogen Adequacy Based on Leaf Color Chart (LCC)”. International Journal of Psychosocial Rehabilitation, vol. 24, no. 1, Feb. 2020, pp. 8318-25, https://doi.org/10.61841/2yhezt16.