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A queueing system with returning customers and waiting line Artalejo Rodríguez, Jesús Manuel 519.8 Retrial queues RTA approximation Simulation Investigación operativa (Matemáticas) 1207 Investigación Operativa The author would like to thank the anonymous referee for his comments which helped to improve the quality and clarity of the paper. This work was supported in part by the University Complutense of Madrid under grant PR161/93-4777. We consider a queueing system where a customer who finds all channels busy must decide either to join the queue or to retry after an exponentially distributed time. The performance of the system can be approximated by using the RTA approximation introduced by Wolff and Greenberg. We present numerical results demonstrating the performance of the approximation for various representative cases. University Complutense of Madrid Depto. de Estadística e Investigación Operativa Fac. de Ciencias Matemáticas TRUE pub 2023-06-20T16:57:13Z 2023-06-20T16:57:13Z 1995-05 journal article https://hdl.handle.net/20.500.14352/57502 0167-6377 10.1016/0167-6377(95)00017-E eng PR161/93-4777. restricted access application/pdf Elsevier