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VENSource Research
Effect of screwcap or cork on levels of SO2 and aromas in Sauvignon blanc
Cork or screwcap? These authors from New Zealand do the comparison.
The full text is at: http://pubs.acs.org/cgi-bin/article.cgi/jafcau/2005/53/i26/pdf/jf0512813.pdf
49 corks versus screwcaps .pdf