1. In Coronavirus Fight, China Gives Citizens a Color Code, With Red Flags, New York Times, 1 March 2020. https://www.nytimes.com/2020/03/01/business/china-coronavirus-surveillance.html
2. Apple and Google partner on COVID-19 contact tracing technology, 10 April 2020. https://www.apple.com/newsroom/2020/04/apple-and-google-partner-on-covid-19-contact-tracing-technology/
3. Coronavirus: Under surveillance and confined at home in Taiwan, BBC News, 24 March 2020. https://www.nytimes.com/2020/03/01/business/china-coronavirus-surveillance.html
4. Privacy and Security in Firebase, 27 November 2019. https://firebase.google.com/support/privacy
5. Coronavirus mobile apps are surging in popularity in South Korea, CNN, 28 February 2020. https://edition.cnn.com/2020/02/28/tech/korea-coronavirus-tracking-apps/index.html