A precise measurement of the direct CP violation parameter The NA48 Collaboration, A. Lai, D. Marras, A. Bevan, R.S. Dosanjh, T.J. Gershon, B. Hay, G.E. Kalmus, C. Lazzeroni, D.J. Munday et al. (149 more) Eur. Phys. J. C, 22 2 (2001) 231-254 Published online: 21 November 2001 DOI: 10.1007/s100520100822