Sayeed Ghani Mischa Schwartz A Decomposition Approximation for the Performance Evaluation of Non-Preemptive Priority in GSM/GPRS. 459-468 2004 conf/broadnets/2004 BROADNETS http://csdl.computer.org/comp/proceedings/broadnets/2004/2221/00/22210459abs.htm db/conf/broadnets/broadnets2004.html#GhaniS04