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Kristian, J., Sandage, A. and Westphal, J.A. (1978) The Extension of the Hubble Diagram. II. New Redshifts and Photometry of Very Distant Galaxy Clusters: First Indication of a Deviation of the Hubble Diagram from a Straight Line. Astrophysical Journal, 221, 383-394.
https://doi.org/10.1086/156038

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