Zhisheng Niu Yoshitaka Takahashi A finite-capacity queue with exhaustive vacation/close-down/setup times and Markovian arrival processes. 1-23 1999 31 Queueing Syst. 1-2 http://dx.doi.org/10.1023/A:1019189610144 db/journals/questa/questa31.html#NiuT99