Adamu, L., Yakubu, S. D., Didigwu, N. E., Abubakar, A., Adaji, I., & Yahaya, M. (2022). Forecasting Nigeria annual yam production using Grey System Model. International Journal of Mathematical Sciences and Optimization: Theory and Applications, 8(1), 109 - 116. https://doi.org/10.6084/m9.figshare.20710417