On Stability of the Three 3-brane Model
  We show that the Goldberger-Wise mechanism for the three 3-brane scenario proposed by Kogan et al. stabilizes the radion. We find that the system of 3-branes stabilizes in such a way that the loss in the scale factor is insignificant. That is, the negative tension brane chooses to stay close to the visible brane. 
Debajyoti Choudhury, Dileep P. Jatkar, Uma Mahanta and Subrata Sur