Letter to the Editor—To the Editor

The model studied in Taube-Netto, M. 1977. Two queues in tandem attended by a single server. Opns. Res.25 140–147, was studied previously in the following papers:

1. Nair, S. S. 1969. On certain priority queues. Mimeo Series 214, Department of Statistics, Purdue University.

2. Nair, S. S. 1970. Semi-Markov analysis of two queues in series attended by a single server. Bull. Soc. Math. Belgique22 355–367.

3. Nair, S. S. 1971. A single server tandem queue. J. Appl. Probab.8 95–109.

4. Nair, S. S. 1973. Two queues in series attended by a single server. Bull. Soc. Math. Belgique25 99–114.