1.
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Natural language interaction with an expert system Lehmann, Hubert
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2.
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A five-valued logic and a system Ferreira, Ulisses
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3.
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Cognitive modules of an NLP knowledge base for language understanding Periñán Pascual, Carlos - Arcas Túnez, Francisco
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4.
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On the implementation of the belief change operators Falappa, Marcelo Alejandro - Fermé, Eduardo L.
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