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2001. In {em Working Notes of the AAAI Spring Symposium on Answer Set Programming}.

@UNPUBLISHED{lee01, title={Additive Fluents}, author={Joohyung Lee and Vladimir Lifschitz}, note={In {em Working Notes of the AAAI Spring Symposium on Answer Set Programming}}, url="http://www.cs.utexas.edu/users/ai-lab/?lee01", year={2001} }