சூரியச் சுழற்சி 18 (Tamil Wikipedia)

Analysis of information sources in references of the Wikipedia article "சூரியச் சுழற்சி 18" in Tamil language version.

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archive.today

books.google.com

doi.org

dx.doi.org

  • Dodson, Helen W.; Hedeman, E. Ruth; Mohler, Orren C. (August 1974). "Comparison of activity in solar cycles 18, 19, and 20". Reviews of Geophysics 12 (3): 329–341. doi:10.1029/RG012i003p00329. 

nasa.gov

science.nasa.gov

oma.be

sidc.oma.be

spacetoday.org

  • "The Sun: Did You Say the Sun Has Spots?". Space Today Online. Retrieved 12 August 2010.

spaceweather.com

  • Spotless Days. "[2]"

springerlink.com

telenet.be

users.telenet.be

web.archive.org