As quoted at http://www.webelements.com/ from these sources:
- G.W.C. Kaye and T.H. Laby in ''Tables of physical and chemical constants'', Longman, London, UK, 15th edition, 1993.
- A.M. James and M.P. Lord in ''Macmillan's Chemical and Physical Data'', Macmillan, London, UK, 1992.
- D.R. Lide, (ed.) in ''Chemical Rubber Company handbook of chemistry and physics'', CRC Press, Boca Raton, Florida, USA, 79th edition, 1998.
- J.A. Dean (ed) in ''Lange's Handbook of Chemistry'', McGraw-Hill, New York, USA, 14th edition, 1992.
As quoted from various sources in an online version of:
- David R. Lide (ed), ''CRC Handbook of Chemistry and Physics, 84th Edition''. CRC Press. Boca Raton, Florida, 2003; Section 12, Properties of Solids; Electrical Resistivity of Pure Metals
As quoted in an online version of:
- David R. Lide (ed), ''CRC Handbook of Chemistry and Physics, 84th Edition''. CRC Press. Boca Raton, Florida, 2003; Section 4, Properties of the Elements and Inorganic Compounds; Physical Properties of the Rare Earth Metals
which further refers to:
- Beaudry, B. J. and Gschneidner, K.A., Jr., in ''Handbook on the Physics and Chemistry of Rare Earths'', Vol. 1, Gschneidner, K.A., Jr. and Eyring, L., Eds., North-Holland Physics, Amsterdam, 1978, 173.
- McEwen, K.A., in ''Handbook on the Physics and Chemistry of Rare Earths'', Vol. 1, Gschneidner, K.A., Jr. and Eyring, L., Eds., North-Holland Physics, Amsterdam, 1978, 411.
As quoted from:
- J.A. Dean (ed), ''Lange's Handbook of Chemistry'' (15th Edition), McGraw-Hill, 1999; Section 4, Table 4.1 Electronic Configuration and Properties of the Elements
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