Peter G. Harrison Harf Zatschler Sojourn Time Distributions in Modulated G-Queues with Batch Processing. 90-99 2004 conf/qest/2004 QEST http://csdl.computer.org/comp/proceedings/qest/2004/2185/00/21850090abs.htm db/conf/qest/qest2004.html#HarrisonZ04