Lockwood, M. «A Doubling of the Sun's Coronal Magnetic Field during the Last 100 Years». Nature, vol. 399, 6735, 1999, pàg. 437–439. Bibcode: 1999Natur.399..437L. DOI: 10.1038/20867.
Lockwood, M. «A Doubling of the Sun's Coronal Magnetic Field during the Last 100 Years». Nature, vol. 399, 6735, 1999, pàg. 437–439. Bibcode: 1999Natur.399..437L. DOI: 10.1038/20867.