@article{ChengDingZhangetal.2014,
  author    = {X. Cheng and M. D. Ding and J. Zhang and X. D. Sun and Y. Guo and Yi-Ming Wang and Bernhard Kliem and Y. Y. Deng},
  title     = {Formation of a double-decker magnetic flux rope in the sigmoidal solar active region 11520},
  journal   = {The astrophysical journal : an international review of spectroscopy and astronomical physics},
  volume    = {789},
  number    = {2},
  doi       = {10.1088/0004-637X/789/2/93},
  year      = {2014},
}