↑ 10,010,1Burns, Jack O.; Hanisch, Robert J.; White, Richard A.; Nelson, Eric R.; Morrisette, Kim A.; Moody, J. Ward (1987-09-01). «A VLA 20 CM survey of poor groups of galaxies». The Astronomical Journal94: 587–617. doi:10.1086/114494. ISSN0004-6256. Bibcode: 1987AJ.....94..587B.
↑ 11,011,1Doe, Stephen M.; Ledlow, Michael J.; Burns, Jack O.; White, Richard A. (1995-07-01). «ROSAT Observations of Five Poor Galaxy Clusters with Extended Radio Sources». The Astronomical Journal110: 46. doi:10.1086/117496. ISSN0004-6256. Bibcode: 1995AJ....110...46D.
↑ 12,012,1Batuski, David J.; Hanisch, Robert J.; Burns, Jack O. (1992-04-01). «VLA observations of radio sources in interacting galaxy pairs in poor clusters». The Astronomical Journal103: 1077–1083. doi:10.1086/116126. ISSN0004-6256. Bibcode: 1992AJ....103.1077B.