@article{Unger:2016GO,
  author = "Unger, Michael",
  title = "{Report of the Working Group on the Composition of Ultra-High Energy Cosmic Rays }",
  doi = "10.22323/1.236.0307",
  journal = "PoS",
  year = 2016,
  volume = "ICRC2015",
  pages = "307"
}