Riccardo Giovanelli; Wegner G.; Haynes M. P. (). „A survey of the Pisces-Perseus supercluster. V. The declination strip +33.5deg to +39.5deg and the main supercluster ridge”. Astronomical Journal. 105: 1251. Bibcode:1993AJ....105.1251W. doi:10.1086/116507. WikidataQ66617643.
Riccardo Giovanelli; Wegner G.; Haynes M. P. (). „A survey of the Pisces-Perseus supercluster. V. The declination strip +33.5deg to +39.5deg and the main supercluster ridge”. Astronomical Journal. 105: 1251. Bibcode:1993AJ....105.1251W. doi:10.1086/116507. WikidataQ66617643.
Riccardo Giovanelli; Wegner G.; Haynes M. P. (). „A survey of the Pisces-Perseus supercluster. V. The declination strip +33.5deg to +39.5deg and the main supercluster ridge”. Astronomical Journal. 105: 1251. Bibcode:1993AJ....105.1251W. doi:10.1086/116507. WikidataQ66617643.