Influence of sulphur cycle on mercury methylation in estuarine sediment (Seine estuary, France) S. Niessen, D. Foucher, O. Clarisse, J. C. Fischer, N. Mikac, Z. Kwokal, V. Fajon and M. Horvat J. Phys. IV France, 107 (2003) 953-956 DOI: 10.1051/jp4:20030456