L. C. Ho, A. V. Filippenko, W. L. W. Sargent (1997). “A Search for "Dwarf" Seyfert Nuclei. III. Spectroscopic Parameters and Properties of the Host Galaxies”. Astrophysical Journal Supplement112 (2): 315-390. arXiv:astro-ph/9704107. Bibcode: 1997ApJS..112..315H. doi:10.1086/313041.
E. Meiavilla, A. Guijarro, A. Castillo-Morales, J. Jimenez-Vicente, E. Florido, S. Arribas, B. Garcia-Lorenzo, E. Battaner (2005). “Asymmetrical structure of ionization and kinematics in the Seyfert galaxy NGC 5033”. Astronomy and Astrophysics433 (1): 79-86. arXiv:astro-ph/0412410. Bibcode: 2005A&A...433...79M. doi:10.1051/0004-6361:20034537.
L. C. Ho, A. V. Filippenko, W. L. W. Sargent (1997). “A Search for "Dwarf" Seyfert Nuclei. III. Spectroscopic Parameters and Properties of the Host Galaxies”. Astrophysical Journal Supplement112 (2): 315-390. arXiv:astro-ph/9704107. Bibcode: 1997ApJS..112..315H. doi:10.1086/313041.
E. Meiavilla, A. Guijarro, A. Castillo-Morales, J. Jimenez-Vicente, E. Florido, S. Arribas, B. Garcia-Lorenzo, E. Battaner (2005). “Asymmetrical structure of ionization and kinematics in the Seyfert galaxy NGC 5033”. Astronomy and Astrophysics433 (1): 79-86. arXiv:astro-ph/0412410. Bibcode: 2005A&A...433...79M. doi:10.1051/0004-6361:20034537.
G. Helou, E. E. Salpeter, Y. Terzian (1982). “Neutral hydrogen in binary and multiple galaxies”. Astronomical Journal87: 1443-1464. Bibcode: 1982AJ.....87.1443H. doi:10.1086/113235.
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L. C. Ho, A. V. Filippenko, W. L. W. Sargent (1997). “A Search for "Dwarf" Seyfert Nuclei. III. Spectroscopic Parameters and Properties of the Host Galaxies”. Astrophysical Journal Supplement112 (2): 315-390. arXiv:astro-ph/9704107. Bibcode: 1997ApJS..112..315H. doi:10.1086/313041.
E. Meiavilla, A. Guijarro, A. Castillo-Morales, J. Jimenez-Vicente, E. Florido, S. Arribas, B. Garcia-Lorenzo, E. Battaner (2005). “Asymmetrical structure of ionization and kinematics in the Seyfert galaxy NGC 5033”. Astronomy and Astrophysics433 (1): 79-86. arXiv:astro-ph/0412410. Bibcode: 2005A&A...433...79M. doi:10.1051/0004-6361:20034537.
G. Helou, E. E. Salpeter, Y. Terzian (1982). “Neutral hydrogen in binary and multiple galaxies”. Astronomical Journal87: 1443-1464. Bibcode: 1982AJ.....87.1443H. doi:10.1086/113235.