Abubakar, A. M., and S. Man-Yahya. “CAT Swarm Optimization Based Clustering Algorithm for Fuzzy Time Series Forecasting”. ARID ZONE JOURNAL OF ENGINEERING, TECHNOLOGY AND ENVIRONMENT, Vol. 15, no. 1, Mar. 2019, pp. 40-54, https://azojete.com.ng/index.php/azojete/article/view/238.