Foundations of a Multilayer Annotation Framework for Twitter Communications During Crisis Events William J Corvey author Sudha Verma author Sarah Vieweg author Martha Palmer author James H Martin author 2012-05 text Proceedings of the Eighth International Conference on Language Resources and Evaluation (LREC’12) Nicoletta Calzolari editor Khalid Choukri editor Thierry Declerck editor Mehmet Uğur Doğan editor Bente Maegaard editor Joseph Mariani editor Asuncion Moreno editor Jan Odijk editor Stelios Piperidis editor European Language Resources Association (ELRA) Istanbul, Turkey conference publication corvey-etal-2012-foundations https://aclanthology.org/L12-1598/ 2012-05