Adan, Ivo; Hooghiemstra, Gerard - In: Mathematical Methods of Operations Research 47 (1998) 3, pp. 341-353
We consider theM/M/c queue, where customers transfer to a critical state when their queueing (sojourn) time exceeds a random time. Lower and upper bounds for the distribution of the number of critical jobs are derived from two modifications of the original system. The two modified systems can be...