@article{articledac1b791,
title   = {Muons in air showers at the Pierre Auger Observatory: measurement of atmospheric production depth},
author = {Aab, A. and Albuquerque, Ivone Freire da Mota e and Souza, Vitor de and Gouffon, Philippe and Prado, R. R. and Santos, Edivaldo Moura and Peixoto, Carlos Jose Todero},
year = {2014},
doi = {10.1103/PhysRevD.90.012012},
journal   = {Physical Review D}
}