1. JACKSON R. R. P., Queueing Process with Phase Type Service, J. Roy. Stat. Soc, 1956, B18, 129-132.798590073.13101
2. REICH P. G., Instability of some Flow Systems of Civil Aviation, Opns. Res. Quart., 1957, 8, 126-132.
3. GHOSAL A., Elements of Operational Research, Hindustan Publishing Corpn., Delhi, India.0196.22701
4. SAATY T. L., Stochastic Network Flows; Advances in Network of Queues, Proc. Symp. Congestion Theory, Univ. of North Carolina, 1966, 86-107.1910040203.18603
5. NELSON R. T., Queueing Network Experiments with Varying Arrivals and Service Processes, Naval Res. Log. Quart., 1966, 13, n° 3, 321-347.