1. The empty category PRO: Processing what can't be seen;Betancort,2004
2. Empty categories access their antecedent during comprehension;Bever;Linguistic Inquiry,1988
3. Empty categories access their antecedents during comprehension of Spanish unaccusatives;Bever;Linguistic Inquiry,1997
4. The role of lexical representation in sentence processing;Boland,1991
5. Evidence for the immediate use of verb control information in sentence processing;Boland;Journal of Memory and Language,1990