Issue No.04 - April (1980 vol.13)
C.H. Sauer , IBM Thomas J. Watson Research Center
A variety of phenomena and interactions defy exact analytic modeling. Approximation can provide a reasonably accurate solution of a realistic model and is computationally inexpensive.
C.H. Sauer, K.M. Chandy, "Approximate Solution of Queueing Models", Computer, vol.13, no. 4, pp. 25-32, April 1980, doi:10.1109/MC.1980.1653573