E. Nummelin

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A General Failure Model: Optimal Replacement with State Dependent Replacement and Failure Costs

E. Nummelin, 1980, Math. Oper. Res..

A conservation property for general GI/G/1 queues with an application to tandem queues

E. Nummelin, E. Nummelin, 1979, Advances in Applied Probability.