Full Idea
Donnellan argued that we could recognize a referential use of a definite description 'the F' by the fact that the speaker could thereby refer to something which is not F.
Gist of Idea
A definite description 'the F' is referential if the speaker could thereby be referring to something not-F
Source
report of Keith Donnellan (Reference and Definite Descriptions [1966]) by Mark Sainsbury - The Essence of Reference 18.5
Book Reference
'Oxford Handbook of Philosophy of Language', ed/tr. Lepore,E/Smith,B [OUP 2008], p.415
A Reaction
If the expression employed achieved reference whether the speaker wanted it to or not, it would certainly look as if the expression was inherently referring.