@article{SunZhaoPuettmannetal.2017,
  author    = {Yuzhuang Sun and Cunliang Zhao and Wilhelm P{\"u}ttmann and Wolfgang Kalkreuth and Shenjun Qin},
  title     = {Evidence of widespread wildfires in a coal seam from the middle Permian of the North China Basin},
  journal   = {Lithosphere},
  volume    = {9},
  doi       = {10.1130/L638.1},
  year      = {2017},
}