Nabeel, Muhammad, Zeeshan Anwar, and Ali Ahsan. “Performance Analysis of Software Maintenance Process Using Stochastic Petri Nets”. Global Journal of Computer Sciences: Theory and Research 8, no. 1 (April 11, 2018): 01–13. Accessed May 6, 2024. https://un-pub.eu/ojs/index.php/gjcs/article/view/3285.