@conference{6613,
  author = {W. Schade and D. Osborn and J. Preusser and Stephen Leone},
  title = {Imaging of semiconductor surface impurities by femtosecond near-field photoconductivity},
  year = {1998},
  publisher = {Opt. Soc. America},
  address = {San Francisco, CA, USA},
  doi = {10.1109/IQEC.1998.680485},
}