@article{Yushkov:2016DN,
  author = "Yushkov, Alexey",
  title = "{Composition at the ``ankle'' measured by the Pierre Auger Observatory: pure or mixed? }",
  doi = "10.22323/1.236.0335",
  journal = "PoS",
  year = 2016,
  volume = "ICRC2015",
  pages = "335"
}