D Branes from Liouville Strings

@article{Ellis1997DBF,
  title={D Branes from Liouville Strings},
  author={John Ellis and Nick E. Mavromatos and Dimitri V. Nanopoulos},
  journal={International Journal of Modern Physics A},
  year={1997},
  volume={12},
  pages={2639-2673}
}
We develop quantization aspects of our Liouville approach to noncritical strings, proposing a path-integral formulation of a second quantization of string theory, that incorporates naturally the couplings of string sources to background fields. Such couplings are characteristic of macroscopic string solutions and/or D-brane theories. Resummation over world-sheet genera in the presence of stringy (σ-model) soliton backgrounds, and recoil effects associated with logarithmic operators on the world… 
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TLDR
It is argued that the black hole microstate can be measured by interference experiments even in the strong coupling region where there is clearly an event horizon, and extracting information which is naively behind the event horizon is possible.