1. V. E. Beneš, A sufficient set of statistics for a simple telephone exchange model,Bell System Technical Journal,36 (1957), pp. 939–964.
2. V. E. Beneš, Fluctuations of telephone traffic,Bell System Technical Journal,36 (1957), pp. 965–973.
3. D. Blackwell, A renewal theorem,Duke Math. Journal.,15 (1948), pp. 145–150.
4. J. W. Cohen, The full availability group of trunks with an arbitrary distribution of the inter-arrival times and a negative exponential holding time distribution,Simon Stevin Wis-en Natuurkundig Tijdschrift,31 (1957), pp. 169–181.
5. A. K. Erlang, Solution of some problems in the theory of probabilities of significance in automatic telephone exchanges,Post Office Electrical Engineer's Journal,10 (1918), pp. 189–197.