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Swirles, B (1935). «The Relativistic Self-Consistent Field». Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences. 152 (877): 625–649. Bibcode:1935RSPSA.152..625S. doi:10.1098/rspa.1935.0211
Norrby, Lars J. (1991). «Why is mercury liquid? Or, why do relativistic effects not get into chemistry textbooks?». Journal of Chemical Education. 68 (2). 110 páginas. Bibcode:1991JChEd..68..110N. doi:10.1021/ed068p110
Andreev, S. V.; Letokhov, V. S.; Mishin, V. I. (21 September 1987). «Laser resonance photoionization spectroscopy of Rydberg levels in Fr». Physical Review Letters. 59 (12): 1274–1276. Bibcode:1987PhRvL..59.1274A. PMID10035190. doi:10.1103/PhysRevLett.59.1274Verifique data em: |data= (ajuda)
Andreev, S. V.; Letokhov, V. S.; Mishin, V. I. (21 September 1987). «Laser resonance photoionization spectroscopy of Rydberg levels in Fr». Physical Review Letters. 59 (12): 1274–1276. Bibcode:1987PhRvL..59.1274A. PMID10035190. doi:10.1103/PhysRevLett.59.1274Verifique data em: |data= (ajuda)