Rumoro, D. P., G. S. Gibbs, S. C. Shah, M. M. Hallock, G. M. Trenholme, M. J. Waddell, and J. P. Bernstein. “Natural Language Processing and Technical Challenges of Influenza-Like Illness Surveillance”. Online Journal of Public Health Informatics, vol. 8, no. 1, Mar. 2016, doi:10.5210/ojphi.v8i1.6575.