The History and Environment of a Faded Quasar: <i>Hubble Space Telescope</i> observations of Hanny’s Voorwerp and IC 2497William C. Keel, Stuart Lynn, D. Thomas et al.|DigitalCommons - CalPoly (California State Polytechnic University)|2012Cited by 40
The History And Environment Of A Faded Quasar: HST Observations Of Hanny's Voorwerp And IC 2497William C. Keel, Galaxy Zoo Team, Chris Lintott et al.|AAS|2011Cited by 0