Barlow, S., J. Temte, Y. Zheteyeva, A. Fowlkes, C. Reed, and D. Cummings. “Utility of Nontraditional Data Sources for Early Detection of Influenza”. Online Journal of Public Health Informatics, Vol. 9, no. 1, May 2017, doi:10.5210/ojphi.v9i1.7636.