Analysis of information sources in references of the Wikipedia article "Refractive index" in English language version.
Incorporates Public Domain material from the U.S. Department of Energy
{{cite book}}: |journal= ignored (help){{cite book}}: |journal= ignored (help){{cite book}}: |journal= ignored (help){{cite book}}: |journal= ignored (help)Incorporates Public Domain material from the U.S. Department of Energy