@misc{misc8b6c7c94,
title   = {The pierre auger observatory II: studies of cosmic ray composition and hadronic interaction models},
author = {Abreu, P and Albuquerque, Ivone Freire da Mota e and Gouffon, Philippe and Carvalho, W Rodrigues de and Tridapalli, D B},
year = {2011}
}