Galaxy cluster number count data constraints on cosmological parameters L. Campanelli, G.L. Fogli, T. Kahniashvili, A. Marrone and Bharat Ratra Eur. Phys. J. C, 72 11 (2012) 2218 Published online: 10 November 2012 DOI: 10.1140/epjc/s10052-012-2218-4