# References on discrete $M/M/\infty$ queue

Do you know any paper/book/web site talking about discrete $M/M/\infty$ queue?

By discrete I mean at each step some clients come and some clients leave, probability of arrival/leave are not defined as a time distribution but as a probability for each time.

My question is related to this one. But here I just want some references so I can learn a bit more.

Thanks

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