Crook, Aidan C.; Huchra, John P.; Martimbeau, Nathalie; Masters, Karen L.; Jarrett, Tom; Macri, Lucas M. (February 2007). «Groups of Galaxies in the Two Micron All Sky Redshift Survey». The Astrophysical Journal655 (2): 790–813. doi:10.1086/510201. Bibcode: 2007ApJ...655..790C.
Storchi-Bergmann, Thaisa και άλλοι. (September 1992). «The Ionization Cone, Obscured Nucleus, and Gaseous Outflow in NGC 3281: A Prototypical Seyfert 2 Galaxy?». Astrophysical Journal396: 45. doi:10.1086/171696. Bibcode: 1992ApJ...396...45S.
Sales, Dinalva A. και άλλοι. (September 2011). «The Compton-thick Seyfert 2 Nucleus of NGC 3281: Torus Constraints from the 9.7 μm Silicate Absorption». The Astrophysical Journal738 (1): 7. doi:10.1088/0004-637X/738/1/109. 109. Bibcode: 2011ApJ...738..109S.
Crook, Aidan C.; Huchra, John P.; Martimbeau, Nathalie; Masters, Karen L.; Jarrett, Tom; Macri, Lucas M. (February 2007). «Groups of Galaxies in the Two Micron All Sky Redshift Survey». The Astrophysical Journal655 (2): 790–813. doi:10.1086/510201. Bibcode: 2007ApJ...655..790C.
Storchi-Bergmann, Thaisa και άλλοι. (September 1992). «The Ionization Cone, Obscured Nucleus, and Gaseous Outflow in NGC 3281: A Prototypical Seyfert 2 Galaxy?». Astrophysical Journal396: 45. doi:10.1086/171696. Bibcode: 1992ApJ...396...45S.
Sales, Dinalva A. και άλλοι. (September 2011). «The Compton-thick Seyfert 2 Nucleus of NGC 3281: Torus Constraints from the 9.7 μm Silicate Absorption». The Astrophysical Journal738 (1): 7. doi:10.1088/0004-637X/738/1/109. 109. Bibcode: 2011ApJ...738..109S.