Harrison P and Ting Ting Lee . A new recursive algorithm for computing generating functions in closed multi-class queueing networks The IEEE Computer Society's 12th Annual International Symposium on Modeling, Analysis, and Simulation of Computer and Telecommunications Systems, 2004. (MASCOTS 2004). Proceedings.. 10.1109/MASCOT.2004.1348255. 0-7695-2251-3. (231-238). http://ieeexplore.ieee.org/document/1348255/