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   63015
   We propose ASCA observations of three X-ray luminous starburst
   galaxies. These objects lie at the upper end of the range of X-ray
   luminosity exhibited by star-forming galaxies. One of the targets is
   potentially the most X-ray luminous starburst galaxy known. Hard X-ray
   observations will help reveal the origin of this powerful emission and
   constrain the possibility that these systems harbour a buried AGN.
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