Ramadevi, V. N., & Chandan, K. (2014). Optimal Strategy Analysis of Two-Phase, N-Policy of M/EK/1 Queuing System with System Break -Downs and Balking. International Journal of Sciences: Basic and Applied Research (IJSBAR), 16(1), 455–474. Retrieved from https://gssrr.org/index.php/JournalOfBasicAndApplied/article/view/2250