Ismailkhan Enayathulla Khan, Rajendran Paramasivam. “Analysis of Batch Encouraged Arrival Markovian Model Due to a Secondary Optional Service, Break-Down and Numerous Vacations”. Mathematical Statistician and Engineering Applications 72, no. 1 (January 12, 2023): 1166–1177. Accessed May 19, 2024. https://www.philstat.org/index.php/MSEA/article/view/2213.