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Pinsky MA, Karlin S. An introduction to stochastic modeling. 4th ed. Amsterdam: : Academic Press 2011.
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Ross SM, MyiLibrary. Introduction to probability models. 9th ed. Amsterdam: : Academic Press 2007. http://catalogue.library.qmul.ac.uk/uhtbin/ezproxy.pl?url=http://lib.myilibrary.com?id=74703