Quasars, Redshifts and Controversies is a 1987 book by Halton Arp, an astronomer famous for his Atlas of Peculiar Galaxies (1966).

[citation needed] Arp asserted that many questions he posed to the scientific establishment are still unanswered and that his requests for more observation time had been systematically rejected.

Halton Arp's proposal was an idea based on analyses done before the sky surveys increased the number of measured redshifts by several orders of magnitude.

The idea was that the cosmological redshift might be showing evidence of periodicity which would be difficult to explain in a Hubble's law universe that had the feature of continuous expansion.

[2] His work is updated in his last book, Catalogue of Discordant Redshift Associations, C. Roy Keys Inc. (February, 2003), ISBN 978-0968368992.