Search for point-like sources of ultra-high energy neutrinos at the Pierre Auger observatory and improved limit on the diffuse flux of tau neutrinos - Abreu, P; Albuquerque, Ivone Freire da Mota e; Souza, Vitor de; Gouffon, Philippe; Peixoto, C J Todero; Tridapalli, D B (Astrophysical Journal Letters, 2012)