Ramadevi VN, Chandan K. Optimal Strategy Analysis of Two-Phase, N-Policy of M/EK/1 Queuing System with System Break -Downs and Balking. IJSBAR. 2014;16(1):455-474. Accessed October 13, 2025. https://www.gssrr.org/JournalOfBasicAndApplied/article/view/2250