Basu, Sarbani; Antia, H. M.; Bogart, Richard S. (August 2004). «Ring‐Diagram Analysis of the Structure of Solar Active Regions». The Astrophysical Journal610 (2): 1157-1168. Bibcode:2004ApJ...610.1157B. doi:10.1086/421843.
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Zhang, Jie; Wang, Yuming; Liu, Yang (10 de noviembre de 2010). «Statistical Properties of Solar Active Regions Obtained from an Automatic Detection System and the Computational Biases». The Astrophysical Journal723 (2): 1006-1018. Bibcode:2010ApJ...723.1006Z. S2CID122852367. doi:10.1088/0004-637X/723/2/1006.
Basu, Sarbani; Antia, H. M.; Bogart, Richard S. (August 2004). «Ring‐Diagram Analysis of the Structure of Solar Active Regions». The Astrophysical Journal610 (2): 1157-1168. Bibcode:2004ApJ...610.1157B. doi:10.1086/421843.
Zhang, Jie; Wang, Yuming; Liu, Yang (10 de noviembre de 2010). «Statistical Properties of Solar Active Regions Obtained from an Automatic Detection System and the Computational Biases». The Astrophysical Journal723 (2): 1006-1018. Bibcode:2010ApJ...723.1006Z. S2CID122852367. doi:10.1088/0004-637X/723/2/1006.
Zhang, Jie; Wang, Yuming; Liu, Yang (10 de noviembre de 2010). «Statistical Properties of Solar Active Regions Obtained from an Automatic Detection System and the Computational Biases». The Astrophysical Journal723 (2): 1006-1018. Bibcode:2010ApJ...723.1006Z. S2CID122852367. doi:10.1088/0004-637X/723/2/1006.