A Rule-Based Approach to the Identification of Spanish Zero Pronouns Luz Rello author Iustina Ilisei author 2009-09 text Proceedings of the Student Research Workshop Irina Temnikova editor Ivelina Nikolova editor Natalia Konstantinova editor Association for Computational Linguistics Borovets, Bulgaria conference publication rello-ilisei-2009-rule https://aclanthology.org/R09-2011/ 2009-09 60 65