 Nor are these like example  (3),  in which the pronoun simply refers to the same thing as the antecedent. Indefinite descriptions like “an anthropologist” are commonly thought to be quantifiers, and expressions like “few professors” are certainly quantifiers, not referring expressions. On most theories of indefinite descriptions, the first sentence of  (13)  is true just in case there is at least one anthropologist who discovered the skeleton called “Lucy”; its truth does not depend on any particular anthropologist. Thus there is no referential antecedent in the first sentence for the pronoun in the second sentence to be co-referential with.