1. Constraints on the ultrahigh-energy photon flux using inclined showers from the haverah park array;Ave;Phys. Rev.,2002
2. Search for ultrahigh energy photons using air showers;Risse;Mod. Phys. Lett.,2007
3. An upper limit to the photon fraction in cosmic rays above 1019 ev from the pierre auger observatory;Abraham;Astropart. Phys.,2007
4. Measurement of the depth of maximum of extensive air showers above 1018 ev;Abraham;Phys. Rev. Lett.,2010
5. Muons in air showers at the pierre auger observatory: measurement of atmospheric production depth;Aab;Phys. Rev.,2014