Spörer Minimum (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Spörer Minimum" in English language version.

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  • Miyahara, H., Masuda, K., Muraki, Y., Kitagawa, H. and Nakamura, T., 2006a, “Variation of solar cyclicity during the Spoerer Minimum”, J. Geophys. Res., 111(A10), A03103. abstract (accessed 12 July 2015)

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  • Yaotiao Jiang and Zhentao Xu, "On the Spörer Minimum", Astrophysics and Space Science, Jan. 1986, Vol. 118, 1-2, pp 159-162. Abstract and link (accessed 12 July 2015)

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  • "History of Sunspot Observations". Retrieved 4 February 2009. The Spörer Minimum (1420 to 1570), named after the German astronomer Gustav Spörer.
  • "The Medieval Warm Period". Retrieved 4 February 2009.

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