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==Original investigation by William G. Tifft==
[[György Paál]] (for QSOs, 1971<ref>
[[György Paál]] (for QSOs, 1971) and [[William G. Tifft]] (for galaxies) were the first to investigate possible redshift quantization, referring to it as "redshift-magnitude banding correlation".<ref>{{cite journal |last=Tifft |first=W. G. |date=1980 |title=Periodicity in the redshift intervals for double galaxies |journal=[[Astrophysical Journal]] |volume=236 |pages=70 |bibcode=1980ApJ...236...70T |doi=10.1086/157719}}</ref> In 1973, he wrote:▼
{{cite journal
|last=Paál |first=G.
|date=1971
|title=The global structure of the universe and the distribution of quasi-stellar objects
|journal=[[Acta Physica Academiae Scientiarum Hungaricae]]
|volume=30 |pages=51–54
|bibcode=1971AcPhH..30...51P
|doi=10.1007/bf03157173
|s2cid=118710050
▲
:"Using more than 200 redshifts in Coma, Perseus, and A2199, the presence of a distinct band-related periodicity in redshifts is indicated. Finally, a new sample of accurate redshifts of bright [[Coma cluster of galaxies|Coma galaxies]] on a single band is presented, which shows a strong redshift periodicity of 220 km s<sup>−1</sup>. An upper limit of 20 km s<sup>−1</sup> is placed on the internal Doppler redshift component of motion in the Coma cluster".<ref>{{cite journal |last=Tifft |first=W. G. |title=Fine Structure Within the Redshift-Magnitude Correlation for Galaxies |editor-last=Shakeshaft |editor-first=J. R |journal=Proceedings of the 58th IAU Symposium: The Formation and Dynamics of Galaxies |volume=58 |pages=255–256 |bibcode=1974IAUS...58..243T |year=1974 }}</ref>
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