Asymptotic singular behaviour of inhomogeneous cosmologies in   Einstein-Maxwell-dilaton-axion theory
  We present the study of exact inhomogeneous cosmological solutions to a four-dimensional low energy limit of string theory containing non-minimal interacting electromagnetic, dilaton and axion fields. We analyze Einstein-Rosen solutions of Einstein-Maxwell-dilaton-axion equations and show, by explicitly taken the asymptotic limits, that they have asymptotically velocity-term dominated (AVTD) singularities. 
Luis A. Lopez, Nora Breton