Tanabe, Yukito; Sugano, Satoru (1954). "On the absorption spectra of complex ions II". Journal of the Physical Society of Japan. 9 (5): 766–779. Bibcode:1954JPSJ....9..766T. doi:10.1143/JPSJ.9.766.
Tanabe, Yukito; Sugano, Satoru (1956). "On the absorption spectra of complex ions III". Journal of the Physical Society of Japan. 11 (8): 864–877. Bibcode:1956JPSJ...11..864T. doi:10.1143/JPSJ.11.864.
Penney, William G.; Schlapp, Robert (1932). "The Influence of Crystalline Fields on the Susceptibilities of Salts of Paramagnetic Ions. I. The Rare Earths, Especially Pr and Nd". Physical Review. 41 (2): 194–207. Bibcode:1932PhRv...41..194P. doi:10.1103/PhysRev.41.194. ISSN0031-899X.
Schlapp, Robert; Penney, William G. (1932). "Influence of Crystalline Fields on the Susceptibilities of Salts of Paramagnetic Ions. II. The Iron Group, Especially Ni, Cr and Co". Physical Review. 42 (5): 666–686. Bibcode:1932PhRv...42..666S. doi:10.1103/PhysRev.42.666. ISSN0031-899X.\
Tanabe, Yukito; Sugano, Satoru (1954). "On the absorption spectra of complex ions II". Journal of the Physical Society of Japan. 9 (5): 766–779. Bibcode:1954JPSJ....9..766T. doi:10.1143/JPSJ.9.766.
Tanabe, Yukito; Sugano, Satoru (1956). "On the absorption spectra of complex ions III". Journal of the Physical Society of Japan. 11 (8): 864–877. Bibcode:1956JPSJ...11..864T. doi:10.1143/JPSJ.11.864.
Penney, William G.; Schlapp, Robert (1932). "The Influence of Crystalline Fields on the Susceptibilities of Salts of Paramagnetic Ions. I. The Rare Earths, Especially Pr and Nd". Physical Review. 41 (2): 194–207. Bibcode:1932PhRv...41..194P. doi:10.1103/PhysRev.41.194. ISSN0031-899X.
Schlapp, Robert; Penney, William G. (1932). "Influence of Crystalline Fields on the Susceptibilities of Salts of Paramagnetic Ions. II. The Iron Group, Especially Ni, Cr and Co". Physical Review. 42 (5): 666–686. Bibcode:1932PhRv...42..666S. doi:10.1103/PhysRev.42.666. ISSN0031-899X.\
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Penney, William G.; Schlapp, Robert (1932). "The Influence of Crystalline Fields on the Susceptibilities of Salts of Paramagnetic Ions. I. The Rare Earths, Especially Pr and Nd". Physical Review. 41 (2): 194–207. Bibcode:1932PhRv...41..194P. doi:10.1103/PhysRev.41.194. ISSN0031-899X.
Schlapp, Robert; Penney, William G. (1932). "Influence of Crystalline Fields on the Susceptibilities of Salts of Paramagnetic Ions. II. The Iron Group, Especially Ni, Cr and Co". Physical Review. 42 (5): 666–686. Bibcode:1932PhRv...42..666S. doi:10.1103/PhysRev.42.666. ISSN0031-899X.\