@conference{6714,
  author = {R. Viotti and A. Daminelli},
  title = {The superluminous star eta Carinae: A multicolour, multiyear investigation},
  year = {1998},
  publisher = {Noordwijk, The Netherlands : ESA Publications Division},
  address = {Sevilla, Spain},
  url = {http://articles.adsabs.harvard.edu/full/1998ESASP.413..297V},
  note = {JILA Pub. 6078},
}