@inproceedings{Wahlberg:2012kf,
  author = "Wahlberg, Hernan",
  title = "{Mass composition of Ultra High Energy Cosmic Rays at the Pierre Auger Observatory}",
  doi = "10.22323/1.134.0052",
  booktitle = "Proceedings of XXIst International Europhysics Conference on High Energy Physics {\textemdash} PoS(EPS-HEP2011)",
  year = 2012,
  volume = "134",
  pages = "052"
}