Paolo Romano Bruno Ciciani Andrea Santoro Francesco Quaglia Fast Computation of Hyper-exponential Approximations of the Response Time Distribution of MMPP/M/1 Queues. 113-120 2008 Annual Simulation Symposium http://doi.ieeecomputersociety.org/10.1109/ANSS-41.2008.28 conf/anss/2008 db/conf/anss/anss2008.html#RomanoCSQ08