Measurement of the cosmic ray spectrum above 4 x '10 Pot. 18' eV using inclined events detected with the Pierre Auger Observatory - Aab, A.; Albuquerque, Ivone Freire da Mota e; Souza, Vitor de; Gouffon, Philippe; Prado, R. R.; Santos, Edivaldo Moura; Peixoto, Carlos Jose Todero (Journal of Cosmology and Astroparticle Physics, 2015)