1. Linguistic Data Consortium. 2017. MUC Data Sets. Retrieved from http://www-nlpir.nist.gov/related_projects/muc/muc_data/muc_data_index.html. Linguistic Data Consortium. 2017. MUC Data Sets. Retrieved from http://www-nlpir.nist.gov/related_projects/muc/muc_data/muc_data_index.html.
2. A. Rodriguez. 2017. MUC - Cohen Courses. Retrieved from http://curtis.ml.cmu.edu/w/courses/index.php/MUC. A. Rodriguez. 2017. MUC - Cohen Courses. Retrieved from http://curtis.ml.cmu.edu/w/courses/index.php/MUC.
3. Linguistic Data Consortium. 2002. Annotation Tasks and Specifications. Retrieved from https://www.ldc.upenn.edu/collaborations/past-projects/ace/annotation-tasks-and-specifications. Linguistic Data Consortium. 2002. Annotation Tasks and Specifications. Retrieved from https://www.ldc.upenn.edu/collaborations/past-projects/ace/annotation-tasks-and-specifications.