Gao, H., and M. A. M. Lynch. “A New Model Approximating M/PH/1 Queuing Systems During the Transient Period”. Mathematical Modelling and Analysis 6, no. 2 (December 15, 2001): 199-209. Accessed November 25, 2024. https://jau.vgtu.lt/index.php/MMA/article/view/9899.