KÜMEL G ET AL: 'The mechanism of the antiherpetic activity of zinc sulphate', JOURNAL OF GENERAL VIROLOGY, SOCIETY FOR GENERAL MICROBIOLOGY, SPENCERS WOOD, GB, vol. 71 ( Pt 12), 1 December 1990 (1990-12-01), pages 2989 - 2997, XP002489439, ISSN: 0022-1317