@TechReport{Hacid-Rigotti-LTCS-99,
author =     {M.-S. ~Hacid and C.~Rigotti},
title =      {{R}epresenting and {R}easoning on {C}onceptual {Q}ueries {O}ver {I}mage {D}atabases},
institution =  {LuFg Theoretical Computer Science, RWTH Aachen},
year =       1999,
type =       {LTCS-Report},
address =      {Germany},
number =     {LTCS-99-02},
note =         {See http://www-lti.informatik.rwth-aachen.de/Forschung/Papers.html}
}