Matrix-geometric solution for two node tandem queueing systems with phase-type servers subject to blocking and failures

Markov-chain model and algorithmic procedure for the performance analysis of closed cyclic queues

“…Altiok [34] introduced phase-type distributions to represent generally distributed processing times. Gün and Makowski [24] considered queueing systems in discrete time with unreliable servers. Altiok and Ranjan [13], Altiok [12], and Helber [25] analyzed flow lines with Cox-2 distributed processing times and finite buffers.…”