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Reference:
• Fundamental Physics Constants
• Favorite Mathematical Constants
• Favorite Mathematical Constants
• International System of Units (SI)
  
• Periodic Tables of elements
  
• X-ray Spectra of Elements
  
• Table of the Nuclides
  
• National Nuclear Data Center (BNL)
  
• Online encyclopedia of mathematics
  
• Physics and Astronomy information on Scirus, scientific Web search engine
  

  UNIX:

• The unix programming environment

  Exact Atomic Clock Time:

• U. S. Naval Observatory Directorate of Time
  
• Local Times Around the World
  

• On-line encyclopedias of math and science
  

  Journals:

• The European Physical Journal D - Atomic, Molecular and Optical Physics
  

• PhysLink

  Misc. links:

• Sofia University Electronic Library