https://thebreakthrough.org/issues/energy/sins-of-a-solar-empire
https://knowledge.wharton.upenn.edu/article/pandemic-turbo-charging-government-innovation-will-stick/?utm_source=kw_newsletter&utm_medium=email&utm_campaign=2020-05-19
https://www.wilsoncenter.org/blog-post/helmut-kohl-collection-new-resource-post-cold-war-history
http://wir2018.wid.world/files/download/wir2018-summary-german.pdf