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Published online by Cambridge University Press: 07 February 2017
The phenomenon of clustering of galaxies was known earlier than the nature of the so called extragalactic nebulae. It was discovered as early as the end of XVIII century by W. Herschel and confirmed by his followers. After the introduction of Schmidt cameras into astronomy, Zwicky suggested that all galaxies participate in clustering. After the discovery of extragalactic radio sources some astronomers have been trying, in different ways, to apply the concept of clustering to them also.