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Published online by Cambridge University Press: 26 July 2016
In the last decade quite a large number of clusters of galaxies have been studied photometrically. Extensive investigations have been carried out by Oemler (1974), MacGillivray et al. (1976), Dressler (1978), Godwin & Peach (1977), Hoffman & Crane (1977), Couch & Newell (1984), Butcher & Oemler (1985), Butcher, Oemler & Wells (1983) and others in order to reveal global photometric properties of clusters.