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Full Idea
The four leading theories of definite descriptions are Frege's, Russell's, Evans's, and Prior's, ...of which to many Frege's is the most intuitive of the four. Frege says they refer to the unique item (if it exists) which satisfies the predicate.
Gist of Idea
The four leading theories of definite descriptions are Frege's, Russell's, Evans's, and Prior's
Source
George Bealer (Propositions [1998], §5)
Book Ref
'Philosophy of Logic: an anthology', ed/tr. Jacquette,Dale [Blackwell 2002], p.127
A Reaction
He doesn't expound the other three, but I record this a corrective to the view that Russell has the only game in town.