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Efrosinin (Ann Oper Res 202:75–102, 2013) examined the optimal allocation of customers in an $$M/M/2$$ M / M / 2 queueing system with heterogeneous servers differentiated by their service rates and reliability attributes. Specifically, the faster server is subject to partial or complete failures, and the slower server is perfectly reliable. The objective is to determine an optimal allocation...
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