RT Journal Article T1 A queueing system with returning customers and waiting line A1 Artalejo Rodríguez, Jesús Manuel AB 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. PB Elsevier SN 0167-6377 YR 1995 FD 1995-05 LK https://hdl.handle.net/20.500.14352/57502 UL https://hdl.handle.net/20.500.14352/57502 LA eng NO 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. NO University Complutense of Madrid DS Docta Complutense RD 9 abr 2025