
https://theconversation.com/in-2010-a-virus-similar-to-sars-cov-2-was-already-present-in-cambodia-154491

https://theconversation.com/el-poder-del-analisis-de-riesgos-para-anticiparse-y-gestionar-desafios-y-amenazas-226994

https://www.statnews.com/2021/03/04/the-short-term-middle-term-and-long-term-future-of-the-coronavirus/