Gas entropy in a representative sample of nearby X-ray galaxy clusters (REXCESS): relationship to gas mass fractionG. W. Pratt, M. Arnaud, R. Piffaretti, H. Böhringer, T. J. Ponman, J. H. Croston, G. M. Voit, S. Borgani and R. G. BowerA&A, 511 (2010) A85DOI: https://doi.org/10.1051/0004-6361/200913309