@conference{5627,
  author = {Keith Julien and Douglas Gough and Juri Toomre},
  title = {Inversion for background inhomogeneity from phase distortion of two-dimensional wave fields},
  year = {1995},
  journal = {unknown},
  month = {1995-01},
  publisher = {Astronomical Society of the Pacific},
  url = {http://adsabs.harvard.edu/full/1995ASPC...76..196J},
  note = {JILA Pub. 5580},
}