1. J.A. Buzacott and D.D. Yao, Flexible manufacturing systems: A review of analytical models, Manage. Sci. 32(1986).
2. Y. Dallery, On queueing network models of flexible manufacturing systems, Large-Scale Systems 11(1986)109.
3. J.J. Solberg, A mathematical model of computerized manufacturing systems,Proc. 4th Int. Conf. on Production Research, Tokyo, Japan (1977).
4. W.J. Gordon and G.F. Newell, Closed queueing networks with exponential servers, Oper. Res. 15(1967)252.
5. J.P. Buzen, Computational algorithms for closed queueing networks with exponential servers, Commun. ACM 16, 9(1973)527.