A targeted search for point sources of EeV photons with the Pierre Auger Observatory - Aab, A.; Albuquerque, Ivone Freire da Mota e; Souza, Vitor de; Prado, R. R.; Carvalho, W. Rodrigues de; Santos, Edivaldo Moura; Peixoto, Carlos Jose Todero (Astrophysical Journal Letters, 2017)