The richest superclusters - I. Morphology M. Einasto, E. Saar, L. J. Liivamägi, J. Einasto, E. Tago, V. J. Martínez, J.-L. Starck, V. Müller, P. Heinämäki, P. Nurmi et al. (2 more) A&A, 476 2 (2007) 697-711 Published online: 23 October 2007 DOI: 10.1051/0004-6361:20078037