@article{ Levesque98,
  author = {Levesque, Hector and Pirri, Fiora and Reiter, Ray}
}
,
  url = {Levesque98.pdf}
}
,
  journal = {Electronic Transactions of AI (ETAI)}
}
,
  title = {Foundations for a Calculus of Situations}
}
,
  number = {3--4}
}
,
  volume = {2}
}
,
  key = {CogRobo}
}
,
  year = {1998}
}
,
  pages = {159--178}
}