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Hahn, O.; Strassmann, F. (10 February 1939). “Proof of the Formation of Active Isotopes of Barium from Uranium and Thorium Irradiated with Neutrons; Proof of the Existence of More Active Fragments Produced by Uranium Fission”. Die Naturwissenschaften27 (6): 89–95. Bibcode: 1939NW.....27...89H. doi:10.1007/BF01488988.
Hahn, O.; Strassmann, F. (10 February 1939). “Proof of the Formation of Active Isotopes of Barium from Uranium and Thorium Irradiated with Neutrons; Proof of the Existence of More Active Fragments Produced by Uranium Fission”. Die Naturwissenschaften27 (6): 89–95. Bibcode: 1939NW.....27...89H. doi:10.1007/BF01488988.
“About Enrico Fermi”. The University of Chicago Library: Digital Activities and Collections. Guide to the Enrico Fermi Collection, Special Collections Research Center, University of Chicago Library. 24 November 2017閲覧。
