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nist.gov
physics.nist.gov
Magnetic constant. 2006 CODATA recommended values. NIST. [2007-08-08]. (原始内容存档于2007-08-20).
Electric constant. 2006 CODATA recommended values. NIST. [2007-08-08]. (原始内容存档于2007-04-23).
Speed of light. 2006 CODATA recommended values. NIST. [2007-08-08]. (原始内容存档于2017-06-25).
web.archive.org
Magnetic constant. 2006 CODATA recommended values. NIST. [2007-08-08]. (原始内容存档于2007-08-20).
Electric constant. 2006 CODATA recommended values. NIST. [2007-08-08]. (原始内容存档于2007-04-23).
Speed of light. 2006 CODATA recommended values. NIST. [2007-08-08]. (原始内容存档于2017-06-25).