https://towardsdatascience.com/a-new-coefficient-of-correlation-64ae4f260310
https://www.brookings.edu/blog/planetpolicy/2017/08/23/grid-storage-in-the-1830s-lessons-for-innovation-in-todays-energy-market/?utm_campaign=Brookings%20Brief&utm_source=hs_email&utm_medium=email&utm_content=55637308
https://www.esri.ie/system/files/publications/SUSTAT96.pdf
https://ec.europa.eu/info/strategy/priorities-2019-2024/europe-fit-digital-age/europes-digital-decade-digital-targets-2030_en