Stellar Active Region Evolution - II. Identification and Evolution of Variance Morphologies in CA II H+K Time SeriesDOI: info:10.1023/A:1004922323928v. 171211–220
Donahue, R. A., Dobson, A. K., and Baliunas, S. L. 1997. "Stellar Active Region Evolution - II. Identification and Evolution of Variance Morphologies in CA II H+K Time Series." Solar Physics, 171 211–220. https://doi.org/10.1023/A:1004922323928.