@article{Grassmann1981TechnicalN, title={Technical Note - The Optimal Estimation of the Expected Number in a M/D/∞ Queueing System}, author={Winfried K. Grassmann}, journal={Operations Research}, year={1981}, volume={29}, pages={1208-1211} }

- Published 1981 in Operations Research
DOI:10.1287/opre.29.6.1208

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