SANNI, K. O., M. O. ADAMU, and V. ODUMUYIWA. “OVERVIEW OF SCHEDULING PROBLEMS WITH LEARNING EFFECT, DETERIORATING EFFECT, MAINTENANCE ACTIVITY AND NON- MONOTONIC TIME-DEPENDENT PROCESSING TIMES”. Unilag Journal of Mathematics and Applications, Vol. 1, no. 1, Sept. 2021, pp. 82-103, http://lagjma.unilag.edu.ng/article/view/1310.