Historical Dictionary of Atomic Espionage - Glenmore S. Trenear-Harvey - Google Books

https://books.google.de/books?id=t1-UFVOwER0C&pg=PA45

Almost from the moment in 1940 that Otto Frisch and Rudofl Peierls suggested, from their small office in the University of Birmingham, that an atomic weapon could be miniaturized and delivered to its target by aircraft, the concept of atomic espionage can…