Unreliable M x /G/1 retrial queue with multi-optional services and impatient customers

@article{Bhagat2013UnreliableMX,
  title={Unreliable M x /G/1 retrial queue with multi-optional services and impatient customers},
  author={Amita Bhagat and Madhu Jain},
  journal={International Journal of Operational Research},
  year={2013},
  volume={17},
  pages={248-273}
}
The present investigation deals with Mx/G/1 retrial queue with unreliable server and general retrial times. The server is subject to breakdowns and takes some setup time before starting the repair. The server renders first essential phase of service (FES) to all the arriving customers whereas second optional phase services (SOS) are provided after FES to only those customers who opt for it. The impatient customers are allowed to balk depending upon server’s status; they may also renege after… 

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