Anillo de Bishop (Spanish Wikipedia)

Analysis of information sources in references of the Wikipedia article "Anillo de Bishop" in Spanish language version.

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1books.google.com

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books.google.com

Albert Riggenbach (1886). Beobachtungen über die Dämmerung, insbesondere über das Purpurlicht und seine Beziehungen zum Bishop'schen Sonnenring. Basel: H. Georg's Verlag. p. 105.