Hordijk, Arie et Koole, Ger, The µc-rule is not optimal in the second node of the tandem queue: a counterexample, Advances in applied probability , 24(1), 1992, pp. 234-237
In this note we give a counterexample which shows that the µc-rule is not optimal in the second node of the tandem queue. This counterexample contradicts the interchange argument in Nain [1] and Nain et al. [2].