I argue that Weak Crossover and Overt Pronoun Constraint effects show up systematically only with non-specific wh-phrases. To account for this contrast, I propose an analysis based on the following condition for binding: features on bound pronouns must be licensed under c-command by features of their binders, therefore binders must be endowed (at least) with all the features of the pronouns they bind.
"The Licensing of Pronominal Features in WCO and OPC Configurations,"
University of Pennsylvania Working Papers in Linguistics:
1, Article 9.
Available at: http://repository.upenn.edu/pwpl/vol16/iss1/9