Perspective Published on 24 Oct 2017 Extended Narrow-Line Region in Seyfert Galaxies in Extragalactic Astronomy Enrico CongiuMarcella ContiniStefano CiroiValentina CraccoFrancesco Di MilleMarco BertonMichele FrezzatoGiovanni La MuraPiero Rafanelli Frontiers in Astronomy and Space Sciences doi 10.3389/fspas.2017.00027 3,931 views 11 citations