1. Banda, J., R. Tekumalla, G. Wang, J. Yu, Tuo Liu, Y. Ding, and G. Chowell, 2020, A Twitter Dataset of 150+ million tweets related to COVID-19 for open research, April 5, https://zenodo.org/record/3738018#.XpJKUcCSlaQ
2. Baumgartner, E., and J. Rainey, 2020. Trump administration ended pandemic early-warning program to detect coronaviruses. Los Angeles Times, April 2.
3. Bengali, S., 2020, Singapore’s migrant workers see virus soar, Los Angeles Times, April 15, p. A1 and A4
4. Brandom, R. 2020, Answering the 12 Biggest Questions about Apple and Google’s New Coronavirus Project, https://www.theverge.com/2020/4/11/21216803/apple-google-coronavirus-tracking-app-covid-bluetooth-secure
5. Crook, J., 2014. Kinsa raises $9.6M Series A For a smart thermometer that tracks the spread of illness. https://techcrunch.com/2014/12/11/kinsa-raises-9-6m-series-a-for-a-smart-thermometer-that-tracks-the-spread-of-illness/