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- https://van.physics.illinois.edu/qa/listing.php?id=1973
- http://www.uni-ulm.de/fkp/lehre/Physics%20Lab%20Anleitungen/optical%20properties%20of%20metals-2
- https://link.springer.com/content/pdf/10.1007/BF03215148.pdf
- http://scienceline.ucsb.edu/getkey.php?key=3903
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- http://nvlpubs.nist.gov/nistpubs/jres/4/jresv4n2p189_A2b.pdf