
https://theconversation.com/dividendos-noticias-financieras-y-sentimientos-un-trio-que-ayuda-a-predecir-el-valor-de-mercado-de-una-empresa-225500

http://intsse.com/wswspdf/en/articles/2019/02/15/zucm-f15.pdf

https://www.newyorker.com/magazine/2020/06/08/how-iceland-beat-the-coronavirus??ncid=newsltukhpmgpols