Abstract
Abstract Two types of expressions have previously been described in these terms: definite pronouns and certain definite noun phrases (NPs). Researchers in computational linguistics and in artificial intelligence have called these expressions anaphors (cf., Woods 1978, Sidner 1983, Bobrow 1986, Hirst 1981, Webber 1983). Linguists, however, have used this term somewhat differently. Many have restricted its use to expressions (usually pronouns) that can be treated analogously to variables in a logical language (Chomsky 1980).
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