http://www.superconductors.org/
http://www.kapitza.ras.ru/
http://www.wmi.badw.de/
http://www.cryogenicsociety.org/
http://ltl.tkk.fi/wiki/LTL/Links_to_other_labs
http://www.aip.org/history/mod/superconductivity/
http://www.iba-protontherapy.com/more-resources/usefull-links
http://p-therapie.web.psi.ch/
http://www.carboniontherapy.org
http://www.ptcs.ch/