References
- Abazajian, K. N., et al., 2009, The Seventh Data Release of the Sloan Digital Sky Survey, ApJS, 182, 543 https://doi.org/10.1088/0067-0049/182/2/543
- Antonucci, R., 1993, Unified models for active galactic nuclei and quasars, ARAA, 31, 473 https://doi.org/10.1146/annurev.aa.31.090193.002353
- Baldwin, J. A., Phillips, M. M., & Terlevich, R., 1981, Classification parameters for the emission-line spectra of extragalactic objects, PASP, 93, 5 https://doi.org/10.1086/130766
- Hao, L., et al., 2005, Active Galactic Nuclei in the Sloan Digital Sky Survey. I. Sample Selection, AJ, 129, 1783 https://doi.org/10.1086/428485
- Hasinger, G., 2008, Absorption properties and evolution of active galactic nuclei, A&A, 490, 905 https://doi.org/10.1051/0004-6361:200809839
- Hog, E., et al., 2000, The Tycho-2 catalogue of the 2.5 million brightest stars, A&A, 355, L27
- Huchra, J. P., Geller, M. J., & Corwin, H. G., Jr., 1995, The CfA Redshift Survey: Data for the NGP +36 Zone, ApJS, 99, 391 https://doi.org/10.1086/192191
- Ishihara, D., et al., 2010, The AKARI/IRC mid-infrared all-sky survey, A&A, 514, 1
- Kataza, H., et al., 2010, AKARI:IRC All-Sky Survey Point Source Catalogue Version 1.0. Release Note (Rev.1)
- Schmidt, M., 1968, Space Distribution and Luminosity Functions of Quasi-Stellar Radio Sources, ApJ, 151, 393 https://doi.org/10.1086/149446
- Toba, Y., et al., 2014, Luminosity and Redshift Dependence of the Covering Factor of Active Galactic Nuclei viewed with WISE and Sloan Digital Sky Survey, ApJ, 788, 45 https://doi.org/10.1088/0004-637X/788/1/45