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2. Equation fit to experimental data obtained from theCRC Handbook of Chemistry and Physics;Lide, D. R., Ed.CRC Press:Boca Raton, FL, 1991; pp6–8.SeeSupporting Informationfor fitting procedure.
3. National Institute of Standards and Technology Website.http://physics.nist.gov/cgi-bin/Star/compos.pl?matno=169(accessed Apr 2011) .