G. Ayyappan, R. Supraja. Analysis of an $M^{[X]} / G_1(a, b), G_2(a, b) / 1$ unreliable G-queue with optional re-service, Bernoulli vacation, delay time to two phase of repair. Malaya J. Mat. [Internet]. 2018 Jul. 1 [cited 2024 Jul. 16];6(03):664-7. Available from: https://www.malayajournal.org/index.php/mjm/article/view/905