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A priority rule based on the ranking of the service times for the M/G/1 queue
Nair, S. Sreekantan, (1969)
Algorithms for the waiting time distributions under various queue disciplines in the M/G/1 queue with service time distributions of phase type
Neuts, Marcel F., (1977)
Explicit steady-state solutions to some elementary queueing models
Neuts, Marcel F., (1982)