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 The $M/G/1$ feedback retrial queue with two types of customers Bull. Korean Math. Soc. 2005 Vol. 42, No. 4, 875-887 Published online December 1, 2005 Yong Wan Lee Andong National University Abstract : In M/G/1 retrial queueing system with two types of customers and feedback, we derived the joint generating function of the number of customers in two groups by using the supplementary variable method. It is shown that our results are consistent with those already known in the literature when $\delta_k=0(k=1,2),\lambda_1=0$\\ ~ or ~ $\lambda_2 = 0$. Keywords : feedback retrial queue, supplementary variable method, retrial time, stationary distribution MSC numbers : 60K25, 90B22 Downloads: Full-text PDF