[1] Xiang Ji, Soon Ae Chun, and James Geller, "Monitoring Public Health Concerns Using Twitter Sentiment Classifications," Proceedings of IEEE International Conference on Healthcare Informatics, Philadelphia, PA, 9-11 September 2013.

[2] Xiang Ji, Soon Ae Chun, and James Geller, "Epidemic Outbreak and Spread Detection System Based on Twitter Data," Proceedings of The 1st International Conference on Health Information Science (HIS 2012): 152-163, Beijing, China, 8-10 April 2012.