Anisotropy and chemical composition of ultra-high energy cosmic rays using arrival directions measured by the Pierre Auger Observatory - Abreu, P.; Albuquerque, Ivone Freire da Mota e; Souza, Vitor de; Gouffon, Philippe; Carvalho junior, W. Rodrigues de; Peixoto, C J Todero; Tridapalli, Diogo Bernardes (Journal of Cosmology and Astroparticle Physics, 2011)