3Park,Seungchul,Choi,Yanghee. An advanced call model to support multimedia multiuser communications[J].Computer Communications,1997.
4A.Deslauriers,J.Pichitlamken,P.L'Ecuyer,A.Ingolfsson,A.Avramidis. Markov chain models of a telephone call center with call blending[J].Computers and Operations Research,2007,(06):1616-1645.
5W.Whitt. Engineering solution of a basic call-center model[J].Management Science,2005,(02):221-235.doi:10.1287/mnsc.1040.0302.