Wiegelmann, Thomas Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society;
Jing, J., Tan, C., Yuan, Y., Wang, B., Wiegelmann, T., Xu, Y., et al. (2010). Free Magnetic Energy and Flare Productivity of Active Regions. Astrophysical Journal, 713, 440-449. doi:10.1088/0004-637X/713/1/440.