Malkan, M. A.; Gorjian, V.; Tam, R. (1998-03-11). "A Hubble Space Telescope Imaging Survey of Nearby Active Galactic Nuclei". The Astrophysical Journal Supplement Series. 117 (1): 25–88. arXiv:astro-ph/9803123. Bibcode:1998ApJS..117...25M. doi:10.1086/313110.
Zhang, J. S.; Henkel, C.; Guo, Q.; Wang, H. G.; Fan, J. H. (2009-12-11). "ON THE NUCLEAR OBSCURATION OF H2O MASER GALAXIES". The Astrophysical Journal. 708 (2): 1528–1536. arXiv:0912.2159. doi:10.1088/0004-637X/708/2/1528.
Marquez, I.; Durret, F.; Delgado, R. M. Gonzalez; Marrero, I.; Masegosa, J.; Maza, J.; Moles, M.; Perez, E.; Roth, M. (1999-09-21). "Near-infrared photometry of isolated spirals with and without an AGN". Astronomy and Astrophysics Supplement Series. 140: 1–14. arXiv:astro-ph/9909351. doi:10.1051/aas:1999516.
Malkan, M. A.; Gorjian, V.; Tam, R. (1998-03-11). "A Hubble Space Telescope Imaging Survey of Nearby Active Galactic Nuclei". The Astrophysical Journal Supplement Series. 117 (1): 25–88. arXiv:astro-ph/9803123. Bibcode:1998ApJS..117...25M. doi:10.1086/313110.
Zhang, J. S.; Henkel, C.; Guo, Q.; Wang, H. G.; Fan, J. H. (2009-12-11). "ON THE NUCLEAR OBSCURATION OF H2O MASER GALAXIES". The Astrophysical Journal. 708 (2): 1528–1536. arXiv:0912.2159. doi:10.1088/0004-637X/708/2/1528.
Marquez, I.; Durret, F.; Delgado, R. M. Gonzalez; Marrero, I.; Masegosa, J.; Maza, J.; Moles, M.; Perez, E.; Roth, M. (1999-09-21). "Near-infrared photometry of isolated spirals with and without an AGN". Astronomy and Astrophysics Supplement Series. 140: 1–14. arXiv:astro-ph/9909351. doi:10.1051/aas:1999516.
Malkan, M. A.; Gorjian, V.; Tam, R. (1998-03-11). "A Hubble Space Telescope Imaging Survey of Nearby Active Galactic Nuclei". The Astrophysical Journal Supplement Series. 117 (1): 25–88. arXiv:astro-ph/9803123. Bibcode:1998ApJS..117...25M. doi:10.1086/313110.