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Hamburg(5)
München(3)
London(2)
Ottawa(2)
Cambridge, Mass.(1)
Evanston, Ill.(1)
Frascati(1)
Harwell(1)
Heidelberg(1)
Meyrin(1)
New Haven, Conn.(1)
Paris(1)
Rochester, NY(1)
Trieste(1)
Washington, DC(1)
Wien(1)