author        = "Karoff, C. and  Knudsen, M. F. and  De Cat, P. and 
                       Bonanno, A. and  Fogtmann-Schulz, A. and  Fu, J. and 
                       Frasca, A. and  Inceoglu, F. and  Olsen, J. and  Zhang, Y.
                       and  Hou, Y. and  Wang, Y. and  Shi, J. and  Zhang, W.",
      title         = "{Observational evidence for enhanced magnetic activity of
                       superflare stars}",
      year          = "2016",