c1 Refereed Journal Article. Doesn't yet have issue number "early view online issue" -Not checked in Sherpa -MA 8/10/13. Added vol, issue & pp., 4.7.14-MMM  -- changed to conference item on the 17/4/17 -- there was an Elements record 260214 for a conference paper (the source '18th IAPRI World Packaging Conference' 9781605950846 pointed back to the journal for the full paper).