https://www.volckeralliance.org/sites/default/files/attachments/RebuildersDilemma_Final.pdf
https://www.project-syndicate.org/commentary/putin-trump-g20-meeting-by-nina-l–khrushcheva-2017-07
http://www.cesifo-group.de/ifoHome/publications/working-papers/CESifoWP/CESifoWPdetails?wp_num=6430&CESifoWP.search=+
https://www.nytimes.com/2020/09/07/world/europe/germany-trump-far-right.html