Answers are grounded in this paper and cite their sources.
Kennedy (1972) showed that the standard single-server queueing model is continuous. These results are extended to the standard multi-server model here. Even when there is only one server, an additional condition is needed for the queue length process.
No takes yet. Share an insight, caveat, or question.
Ward Whitt (1974) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: