Royal Society (London) (1660-)(7)
Bakker, Cornelis (1904-1960)(6)
Jentschke, Willibald (1911-2002)(6)
Københavns Universitet. Institut for Teoretisk Fysik (1921-1974)(6)
University of Rochester (1850-)(6)
Encyclopaedia Britannica, Inc.(5)
Internationale Atomenergie-Organisation (1957-)(5)
Princeton University. Department of Physics(5)
Wheeler, John Archibald (1911-2008)(5)
Cockcroft, John (1897-1967)(4)