SAO/NASA Astrophysics Data System (ADS)
Title:
Visibility limit of naked-eye sunspots
Authors:
Keller, H. U. & Friedli, T. K.
Journal:
Royal Astronomical Society, Quarterly Journal (ISSN 0035-8738), vol. 33, no. 2, June 1992, p. 83-89.
Bibliographic Code:
1992QJRAS..33...83K
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