1. Centers for Disease Control and Prevention. How COVID-19 spreads. https://www.cdc.gov/coronavirus/2019-ncov/prevent-getting-sick/how-covid-spreads.html (2020). Accessed 8 Mar 2011
2. Sauter, M. B., Stebbins, S. How the current stock markets? https://www.usatoday.com/story/money/2020/03/21/stock-market-collapse-how-does-todays-compare-others/2890885001/ (2020). Accessed 8 Mar 2011
3. Li, Y. This was the fastest 30% sell-off ever, exceeding the pace of declines during the great depression. https://www.cnbc.com/2020/03/23/this-was-the-fastest-30percent-stock-market-decline-ever.html (2020). Accessed 8 Mar 2011
4. Baumöhl, E., Kočenda, E., Lyócsa, Š, Výrost, T.: Networks of volatility spillovers among stock markets. Phys. A 490, 1555–1574 (2018). https://doi.org/10.1016/j.physa2017.08.123
5. Gamba-Santamaria, S., Gomez-Gonzalez, J.E., Hurtado-Guarin, J.L., Melo-Velandia, L.F.: Volatility spillovers among global stock markets: Measuring total and directional effects. Empir Econ. 56(5), 1581–1599 (2017). https://doi.org/10.1007/s00181-017-1406-3