Environments of nearby quasars in Sloan Digital Sky SurveyH. Lietzen, P. Heinämäki, P. Nurmi, E. Tago, E. Saar, J. Liivamägi, E. Tempel, M. Einasto, J. Einasto, M. Gramann and L. O. TakaloA&A, 501 1 (2009) 145-155DOI: https://doi.org/10.1051/0004-6361/200911628
