In generative syntax, clitic doubling is an occurrence of a clitic in the presence of a corresponding (pronominal) object in a number of Romance languages.
Such as Spanish:
Juan me visito a mi ayer Juan me visited (to) me yesterday
All pronominal objects, such as mi in the example, must be 'doubled' by a corresponding clitic, in this case me.
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- Jaeggli, O. 1982. Topics in Romance syntax. Dordrecht: Foris.
- Jaeggli, O. 1986. Three Issues in the Theory of clitics: Case, Doubled NP's, and Extraction. In Borer, H. (ed.) Syntax and Semantics 19:, the Syntax of Pronominal Clitics. New York: Academic Press.
- Spencer, A. 1991. Morphological Theory. Blackwell, Oxford.