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harvard.edu
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Parker, E. N. (1979). "Sunspots and the Physics of Magnetic Flux Tubes. I The General Nature of the Sunspot". The Astrophysical Journal. 230: 905–913. Bibcode:1979ApJ...230..905P. doi:10.1086/157150.
Bhardwaj, A.; Gladstone, G. R.; Zarka, P. (2001). "An Overview of Io Flux Tube Footpoints in Juptier's Auroral Ionosphere". Advances in Space Research. 27 (11): 1915–1922. Bibcode:2001AdSpR..27.1915B. doi:10.1016/s0273-1177(01)00280-0.