Published in
Oxford University Press, Publications of Astronomical Society of Japan, 3(64), p. 54, 2012
DOI: 10.1093/pasj/64.3.54
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Magnetic Helicity of Solar Active Regions as Revealed by Vector Magnetograms and Coronal X-Ray Images
Journal article published in 2012 by
Haiqing Xu,
Yu Gao,
Hongqi Zhang,
Takashi Sakurai,
Masaoki Hagino,
Dmitry Sokoloff,
Alexei A. Pevtsov 
This paper is made freely available by the publisher.
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