@conference{4968,
  author = {C. Urry and J. Shull},
  title = {Multiwavelength monitoring of the BL Lac object PKS 2155-304. I. IUE Observations},
  year = {1992},
  url = {http://adsabs.harvard.edu/full/1992ESOC...44...89U},
  note = {JILA Pub. 4806},
}