S. Pavai Madheswari, and S.A. Josephine. 2019. “Analysis of an \(M / G / 1\) Retrial Queue With Second Optional Service and Customer Feedback, under Bernoulli Vacation Schedule”. Malaya Journal of Matematik 7 (04). India:795-807. https://doi.org/10.26637/MJM0704/0027.