Lester Lipsky. N-type Queueing Loops with Generalizations. Operations Research, 33(4):911-927, 1985. [doi]
@article{Lipsky85, title = {N-type Queueing Loops with Generalizations}, author = {Lester Lipsky}, year = {1985}, doi = {10.1287/opre.33.4.911}, url = {http://dx.doi.org/10.1287/opre.33.4.911}, researchr = {https://researchr.org/publication/Lipsky85}, cites = {0}, citedby = {0}, journal = {Operations Research}, volume = {33}, number = {4}, pages = {911-927}, }