https://theconversation.com/cual-es-el-material-mas-usado-del-mundo-y-el-que-menos-se-investiga-213576
https://lawliberty.org/the-silicon-valley-bailout/
https://www.epsu.org/sites/default/files/article/files/Going%20Public_EPSU-PSIRU%20Report%202019%20-%20EN.pdf