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GNII. The expressions are derived using the results of the two-stage tandem queue, MIGI-G2!1, already considered by some authors and the well-known Pollaczek-Khintchine forrnula. With the first-in, first-out service discipline, the mean waiting times in the first s age are derived for some switching rules and upper and lower bounds  ' for the mean sejourn times and the rnean waiting times for workload conserving switching ru!es are also obtained,

MEAN SOJOURN TIMES IN A MULTI-STAGE TANDEM QUEUE SERVED BY A SINGLE SERVER