Hahn, O.; Strassmann, F. (1939). “Über den Nachweis und das Verhalten der bei der Bestrahlung des Urans mittels Neutronen entstehenden Erdalkalimetalle” [On the detection and characteristics of the alkaline earth metals formed by irradiation of uranium with neutrons]. Die Naturwissenschaften. 27: 11. Bibcode:1939NW.....27...11H. doi:10.1007/BF01488241.
Hahn, O.; Strassmann, F. (1939). “Über den Nachweis und das Verhalten der bei der Bestrahlung des Urans mittels Neutronen entstehenden Erdalkalimetalle” [On the detection and characteristics of the alkaline earth metals formed by irradiation of uranium with neutrons]. Die Naturwissenschaften. 27: 11. Bibcode:1939NW.....27...11H. doi:10.1007/BF01488241.
Hoddeson và đồng nghiệp 1993, tr. 42–44. Hoddeson, Lillian; Henriksen, Paul W.; Meade, Roger A.; Westfall, Catherine L. (1993). Critical Assembly: A Technical History of Los Alamos During the Oppenheimer Years, 1943–1945. New York: Cambridge University Press. ISBN0-521-44132-3. OCLC26764320.
Hoddeson và đồng nghiệp 1993, tr. 54–56. Hoddeson, Lillian; Henriksen, Paul W.; Meade, Roger A.; Westfall, Catherine L. (1993). Critical Assembly: A Technical History of Los Alamos During the Oppenheimer Years, 1943–1945. New York: Cambridge University Press. ISBN0-521-44132-3. OCLC26764320.
Hoddeson và đồng nghiệp 1993, tr. 44–45. Hoddeson, Lillian; Henriksen, Paul W.; Meade, Roger A.; Westfall, Catherine L. (1993). Critical Assembly: A Technical History of Los Alamos During the Oppenheimer Years, 1943–1945. New York: Cambridge University Press. ISBN0-521-44132-3. OCLC26764320.
