Hagemann, F.; Katzin, L. I.; Studier, M. H.; Ghiorso, A.; Seaborg, G. T. (1947). "The (4n + 1) Radioactive Series: The Decay Products of U233". Physical Review. 72 (3): 252. Bibcode:1947PhRv...72..252H. doi:10.1103/PhysRev.72.252.
English, A. C.; Cranshaw, T. E.; Demers, P.; Harvey, J. A.; Hincks, E. P.; Jelley, J. V.; May, A. N. (1947). "The (4n + 1) Radioactive Series". Physical Review. 72 (3): 253–254. Bibcode:1947PhRv...72..253E. doi:10.1103/PhysRev.72.253.
Griswold, J. R.; Medvedev, D. G.; Engle, J. W.; et al. (2016). "Large scale accelerator production of 225Ac: Effective cross sections for 78-192 MeV protons incident on 232Th targets". Applied Radiation and Isotopes. 118: 366–374. doi:10.1016/j.apradiso.2016.09.026. PMID27776333.
Hagemann, F.; Katzin, L. I.; Studier, M. H.; Ghiorso, A.; Seaborg, G. T. (1947). "The (4n + 1) Radioactive Series: The Decay Products of U233". Physical Review. 72 (3): 252. Bibcode:1947PhRv...72..252H. doi:10.1103/PhysRev.72.252.
English, A. C.; Cranshaw, T. E.; Demers, P.; Harvey, J. A.; Hincks, E. P.; Jelley, J. V.; May, A. N. (1947). "The (4n + 1) Radioactive Series". Physical Review. 72 (3): 253–254. Bibcode:1947PhRv...72..253E. doi:10.1103/PhysRev.72.253.
Griswold, J. R.; Medvedev, D. G.; Engle, J. W.; et al. (2016). "Large scale accelerator production of 225Ac: Effective cross sections for 78-192 MeV protons incident on 232Th targets". Applied Radiation and Isotopes. 118: 366–374. doi:10.1016/j.apradiso.2016.09.026. PMID27776333.