Fermi, E. (1934). "Possible Production of Elements of Atomic Number Higher than 92". Nature133 (3372): 898–899. doi:10.1038/133898a0. Bibcode: 1934Natur.133..898F.
Ruth Lewin Sime (2000). "The Search for Transuranium Elements and the Discovery of Nuclear Fission". Physics in Perspective2 (1): 48–62. doi:10.1007/s000160050036. Bibcode: 2000PhP.....2...48S.
Fermi, E. (1934). "Possible Production of Elements of Atomic Number Higher than 92". Nature133 (3372): 898–899. doi:10.1038/133898a0. Bibcode: 1934Natur.133..898F.
Ruth Lewin Sime (2000). "The Search for Transuranium Elements and the Discovery of Nuclear Fission". Physics in Perspective2 (1): 48–62. doi:10.1007/s000160050036. Bibcode: 2000PhP.....2...48S.