* [1] Lucidcafe` Library
http://www.lucidcafe.com/library/95oct/nobhr.html
http://www.aip.org/history/newsletter/spring2000/copenhagen.htm
* [4] Niels Bohr Archive (Documents released on 6 February 2002 relating to the 1941 Bohr-Heisenberg metting)
http://www.nbi.dk/NBA/webpage.html
*[5] Niels Bohr Institute