et. al., H. Merlyn Margaret,. “Analysis Of The M G 1 Queue With Setup Costs In Fuzzy Environments Using Parametric Nonlinear Programming”. Turkish Journal of Computer and Mathematics Education (TURCOMAT), vol. 12, no. 7, Apr. 2021, pp. 684-91, https://www.turcomat.org/index.php/turkbilmat/article/view/2638.