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平台:
ProQuest Agricultural & Environmental Science Database
(Available from 2009/01/01.)
ProQuest SciTech Premium Collection
(Available from 2009/01/01.)
PubMed Central Open Access
(Available from 2005 volume: 1 until 2010 volume: 6.)
SpringerLink Open Access
(Available from 2005/12/01 volume: 1 issue: 1 until 2010/12/31 volume: 6 issue: 1.)