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'''Redshift quantization''', also
{{cite journal |last=Tifft |first=W. G. |date=2006 |title=Redshift periodicities, The Galaxy-Quasar Connection |journal=[[Astrophysics and Space Science]] |volume=285 |issue=2 |pages=429–449 |bibcode=2003Ap&SS.285..429T |doi=10.1023/A:1025457030279}}</ref> '''redshift discretization''',<ref name=Karlsson>{{cite journal |last=Karlsson |first=K. G. |date=1970 |title=Possible Discretization of Quasar Redshifts |journal=[[Astronomy and Astrophysics]] |volume=13 |issue= |pages=333 |bibcode=1971A&A....13..333K |doi=}}</ref> '''preferred redshifts'''<ref>{{cite journal |last1=Arp |first1=H. |last2=Russel |first2=D. |date=2001 |title=A Possible Relationship between Quasars and Clusters of Galaxies |journal=[[Astrophysical Journal]] |volume=549 |issue=2 |pages=802 |bibcode=2001ApJ...549..802A |doi=10.1086/319438|quote=The clusters and the galaxies in them tend to be strong X-ray and radio emitters, and their redshifts occur at preferred redshift values.}}</ref> and '''redshift-magnitude bands''',<ref>{{cite journal |last=Tifft |first=W. G. |date=1973 |title=Properties of the redshift-magnitude bands in the Coma cluster |journal=[[Astrophysical Journal]] |volume=179 |issue= |pages=29 |bibcode=1973ApJ...179...29T |doi=10.1086/151844}}</ref><ref>{{cite journal |last1=Nanni |first1=D. |last2=Pittella |first2=G. |last3=Trevese |first3=D. |last4=Vignato |first4=A. |date=1981 |title=An analysis of the redshift-magnitude band phenomenon in the Coma Cluster |journal=[[Astronomy and Astrophysics]] |volume=95 |issue=1 |pages=188 |bibcode=1981A&A....95..188N |doi=}}</ref> is the [[hypothesis]] that the [[redshift]]s of cosmologically distant objects (in particular [[galaxies]] and [[quasars]]) tend to cluster around multiples of some particular value.
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