Characterization of optimal order of servers in a tandem queue with blocking. - J. George Shanthikumar; Genji Yamazaki; Hirotaka Sakasegawa (Oper. Res. Lett., 1991)

On the equivalence of three types of blocking in non-Markovian tandem queues. - Hirotaka Sakasegawa; Takeshi Kawashima (Queueing Syst. Theory Appl., 1994)