Ardha, Mhd. Zoel, et al. “The Application of the Fletcher-Reeves Algorithm to Predict Spinach Vegetable Production in Sumatra”. International Journal of Engineering and Computer Science Applications (IJECSA), vol. 2, no. 1, Jan. 2023, pp. 11-22, https://doi.org/10.30812/ijecsa.v2i1.2417.