Boris V. Komberg, Andrey V. Kravtsov, Vladimir N. Lukash; "The search and investigation of the Large Groups of Quasars" Komberg, B. V.; Kravtsov, A. V.; Lukash, V. N. (1996). „The search for and investigation of large quasar groups”. Monthly Notices of the Royal Astronomical Society. 282 (3): 713—722. arXiv:astro-ph/9602090. doi:10.1093/mnras/282.3.713.; Bibcode:1996astro.ph..2090K;
Boris V. Komberg, Andrey V. Kravtsov, Vladimir N. Lukash; "The search and investigation of the Large Groups of Quasars" Komberg, B. V.; Kravtsov, A. V.; Lukash, V. N. (1996). „The search for and investigation of large quasar groups”. Monthly Notices of the Royal Astronomical Society. 282 (3): 713—722. arXiv:astro-ph/9602090. doi:10.1093/mnras/282.3.713.; Bibcode:1996astro.ph..2090K;
Boris V. Komberg, Andrey V. Kravtsov, Vladimir N. Lukash; "The search and investigation of the Large Groups of Quasars" Komberg, B. V.; Kravtsov, A. V.; Lukash, V. N. (1996). „The search for and investigation of large quasar groups”. Monthly Notices of the Royal Astronomical Society. 282 (3): 713—722. arXiv:astro-ph/9602090. doi:10.1093/mnras/282.3.713.; Bibcode:1996astro.ph..2090K;
R.G. Clowes; "Large Quasar Groups - A Short Review"; The New Era of Wide Field Astronomy, ASP Conference Series, vol. 232.; 2001; Astronomical Society of the Pacific; ISBN1-58381-065-X ; Bibcode:2001ASPC..232..108C