Erik M. M. Winands Ivo J. B. F. Adan G. J. van Houtum Mean value analysis for polling systems. 35-44 2006 54 Queueing Syst. 1 http://dx.doi.org/10.1007/s11134-006-7898-8 db/journals/questa/questa54.html#WinandsAH06