Wiegelmann, Thomas Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society;
Jing, J., Chen, P. F., Wiegelmann, T., Xu, Y., Park, S.-H., & Wang, H. (2009). Temporal Evolution of Free Magnetic Energy Associated with Four X-Class Flares. Astrophysical Journal, 696, 84-90. doi:10.1088/0004-637X/696/1/84.