“…A queueing system M/Ga'b/1 becomes more attractive (both theoretically and practically) if, in addition to the assumptions about quorum systems accepted in [7,8,23], the input stream is allowed to be bulk. In contrast with models of type M/Ga'b/1, in which the queue length, being less than a, will always (with probability 1) reach a, in systems MX/Ga'b/1 (with general bulk input) the probability of reaching exactly level a in similar situations is less than 1 (in most cases even very small).…”