Extended parameterisations for MSTW PDFs and their effect on lepton charge asymmetry from W decays A. D. Martin, A. J. Th. M. Mathijssen, W. J. Stirling, R. S. Thorne, B. J. A. Watt and G. Watt Eur. Phys. J. C, 73 2 (2013) 2318 Published online: 28 February 2013 DOI: 10.1140/epjc/s10052-013-2318-9