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WikiPedia: Otto Frisch http://cantic.bnc.cat/registres/CUCId/a12362074 http://data.rero.ch/02-A003265774 http://www.mpoweruk.com/coal.htm http://www.nature.com/physics/looking-back/meitner... http://adsabs.harvard.edu/abs/1933ZPhy...85....4F http://adsabs.harvard.edu/abs/1939Natur.143..239M http://adsabs.harvard.edu/abs/1939Natur.143..276F http://alsos.wlu.edu/qsearch.aspx?browse=people/Fr... http://lanl.gov/history/wartime/britishmission.sht... http://katalog.nsk.hr/F/?func=direct&doc_number=00...