Subjects, Topics and the Interpretation of Referential pro.

Acknowledgements
This paper has benefited from discussion and comments on the part of several colleagues and
friends, on various occasions. Special thanks to Roland Hinterhölzl, for careful reading and
important discussions. I also thank Valentina Bianchi, Anna Cardinaletti, Luis Lopez,
Annarita Puglielli, Francesca Ramaglia, Halldór SigurDsson and Alessandra Trecci for
precious comments and relevant observations. Finally, I wish to thank Marcel den Dikken
and three anonymous reviewers of NLLT for their helpful criticism and important
suggestions. Usual disclaimers apply.
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