1Yin Zhang,Jihong Liu,Hongqi Zhang. Relationship between Rotating Sunspots and Flares[J] 2008,Solar Physics(1):39~52
2M. J. Hagyard,J. B. Smith,D. Teuber,E. A. West. A quantitative study relating observed shear in photospheric magnetic fields to repeated flaring[J] 1984,Solar Physics(1):115~126