On Priority Queues in Heavy Traffic

[1]  D. Gaver.  A Waiting Line with Interrupted Service, Including Priorities , 1962 .

[2]  J. Kingman.  On Queues in Heavy Traffic , 1962 .

[3]  D. V. Lindley,et al.  The theory of queues with a single server , 1952, Mathematical Proceedings of the Cambridge Philosophical Society.