The spectroscopically confirmed huge cosmic structure at z = 0.55 M. Tanaka, A. Finoguenov, T. Kodama, Y. Koyama, B. Maughan and F. Nakata A&A, 505 2 (2009) L9-L12 Published online: 15 September 2009 DOI: 10.1051/0004-6361/200912929