VizieR online Data Catalogue associated with article published in journal Astronomy & Astrophysics with title 'A rare example of low surface-brightness radio lobes in a gas-rich early-type galaxy: the story of NGC 3998.' (bibcode: 2016A&A...592A..94F)
Frank, B. S. (Contributor), Morganti, R. (Contributor), Oosterloo, T. (Contributor), Nyland, K. (Contributor), Serra, P. (Contributor) (4-aug.-2016). Radio continuum and gas reservoir in NGC 3998. University of Groningen. 10.26093/cds/vizier.35920094