Galaxy Clusters/ 銀河クラスター

The Extragalactic Distance Database (EDD)
http://edd.ifa.hawaii.edu/
https://arxiv.org/abs/0902.3668
https://arxiv.org/abs/0902.3675
http://iopscience.iop.org/article/10.1088/0004-6256/138/2/323
http://iopscience.iop.org/article/10.1088/0004-6256/138/6/1938