Large-scale environments of z < 0.4 active galaxies H. Lietzen, P. Heinämäki, P. Nurmi, L. J. Liivamägi, E. Saar, E. Tago, L. O. Takalo and M. Einasto A&A, 535 (2011) A21 Published online: 26 October 2011 DOI: 10.1051/0004-6361/201116550