David L. Jagerman Baris Balcioglu Tayfur Altiok Benjamin Melamed Mean Waiting Time Approximations in the G/G/1 Queue. 481-506 2004 46 Queueing Syst. 3-4 http://dx.doi.org/10.1023/B:QUES.0000027996.28824.89 db/journals/questa/questa46.html#JagermanBAM04