Event Ordering. Temporal Annotation on Top of the BulTreeBank Laska Laskova 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 laskova-2009-event https://aclanthology.org/R09-2008/ 2009-09 40 44