bin Mustafa, M. S., and A. T. bin Othman. “A Linear Algebraic Approach In Analyzing the M/GE/1 And GE/M/1 Queuing Systems At Equilibrium”. Malaysian Journal of Computer Science, vol. 9, no. 1, June 2017, pp. 6-11, https://ijps.um.edu.my/index.php/MJCS/article/view/2889.