1. L. Brewer and G. Rosenblatt, Chem. Rev. 61, 257 (1961).CHREAY0009-2665
2. The lowest configuration of Ce and Th are not certain, there being considerable interaction between S2(nf)2, S2nf(n+1)d, and S2(n+1)d2 in these atoms. Thus, Ce and Th are not necessarily good examples for the configuration S2f2.
3. H. G. Bennewitz, W. Paul, and C. Schlier, Z. Physik 141, 6 (1955).ZEPYAA0044-3328
4. L. Wharton, R. A. Berg, and W. Klemperer, J. Chem. Phys. 39, 2023 (1963).JCPSA60021-9606
5. A. Büchler, J. L. Stauffer, and W. Klemperer, J. Am. Chem. Soc. 86, 4544 (1964).JACSAT0002-7863