Bruce Peterson; Enya K.; Yoshii Y.; Kobayashi Y.; Minezaki T.; Suganuma M.; Tomita H. (). „JHK' imaging photometry of Seyfert 1 active galactic nuclei and quasars. I. Multiaperture photometry”. The Astrophysical Journal Supplement Series (în engleză). 141 (1): 23–29. arXiv:astro-ph/0204009. Bibcode:2002ApJS..141...23E. doi:10.1086/339506. WikidataQ66649329.
Bruce Peterson; Enya K.; Yoshii Y.; Kobayashi Y.; Minezaki T.; Suganuma M.; Tomita H. (). „JHK' imaging photometry of Seyfert 1 active galactic nuclei and quasars. I. Multiaperture photometry”. The Astrophysical Journal Supplement Series (în engleză). 141 (1): 23–29. arXiv:astro-ph/0204009. Bibcode:2002ApJS..141...23E. doi:10.1086/339506. WikidataQ66649329.
Hewitt A.; Burbidge G. (). „An optical catalog of extragalactic emission-line objects similar to quasi-stellar objects”. The Astrophysical Journal Supplement Series (în engleză). 75: 297–356. Bibcode:1991ApJS...75..297H. doi:10.1086/191533. WikidataQ66617595.
Bruce Peterson; Enya K.; Yoshii Y.; Kobayashi Y.; Minezaki T.; Suganuma M.; Tomita H. (). „JHK' imaging photometry of Seyfert 1 active galactic nuclei and quasars. I. Multiaperture photometry”. The Astrophysical Journal Supplement Series (în engleză). 141 (1): 23–29. arXiv:astro-ph/0204009. Bibcode:2002ApJS..141...23E. doi:10.1086/339506. WikidataQ66649329.
Hewitt A.; Burbidge G. (). „An optical catalog of extragalactic emission-line objects similar to quasi-stellar objects”. The Astrophysical Journal Supplement Series (în engleză). 75: 297–356. Bibcode:1991ApJS...75..297H. doi:10.1086/191533. WikidataQ66617595.
Bruce Peterson; Enya K.; Yoshii Y.; Kobayashi Y.; Minezaki T.; Suganuma M.; Tomita H. (). „JHK' imaging photometry of Seyfert 1 active galactic nuclei and quasars. I. Multiaperture photometry”. The Astrophysical Journal Supplement Series (în engleză). 141 (1): 23–29. arXiv:astro-ph/0204009. Bibcode:2002ApJS..141...23E. doi:10.1086/339506. WikidataQ66649329.
Hewitt A.; Burbidge G. (). „An optical catalog of extragalactic emission-line objects similar to quasi-stellar objects”. The Astrophysical Journal Supplement Series (în engleză). 75: 297–356. Bibcode:1991ApJS...75..297H. doi:10.1086/191533. WikidataQ66617595.