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  1. Planning in a hierarchy of abstraction spaces.Earl D. Sacerdoti - 1974 - Artificial Intelligence 5 (2):115-135.
  • Human and Computational Question Answering.Wendy Lehnert - 1977 - Cognitive Science 1 (1):47-73.
    The ability to answer questions about a text is the strongest possible demonstration of text comprehension. The question‐answering problems that arise in a story‐understanding system are discussed. Some solutions are described and illustrated by a computer program, which reads stories, and answers questions.
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  • Strips: A new approach to the application of theorem proving to problem solving.Richard E. Fikes & Nils J. Nilsson - 1971 - Artificial Intelligence 2 (3-4):189-208.