1. Erlang, A.K.: The Theory of Probabilities and Telephone Conversations. Nyt Tidsskrift for Matematik, B 20 (1909)
2. Erlang, A.K.: Solution of some Problems in the Theory of Probabilities of Significance in Automatic Telephone Exchanges. Elektroteknikeren 17 (1917)
3. Erlang, A.K.: Telephone Waiting Times. Matematisk Tidsskrift, B 31 (1920)
4. Cobham, A.: Priority Assignment in Waiting Line Problems. Journal of the Operations Research Society of America (1954)
5. Jackson, J.R.: Jobshop like Queueing Sysems. Management Science 10 (1963)