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平台:
DOAJ Directory of Open Access Journals
(Available from 2020.)
JSTOR Arts and Sciences XIV
(Available from 1933/07/01 volume: 28 until 2019/12/31 volume: 102 issue: 4. Available from 2020/01/01 volume: 103 issue: 1 until 2020/01/31 volume: 103 issue: 4.)
ProQuest Agricultural & Environmental Science Database
(Available from 2001/02/01 volume: 84 issue: 1 until 2019/12/31 volume: 102 issue: 4.)
ProQuest Biological Science Database
(Available from 2001/02/01 volume: 84 issue: 1 until 2019/12/31 volume: 102 issue: 4.)
ProQuest Earth, Atmospheric & Aquatic Science Database
(Available from 2001/02/01 volume: 84 issue: 1 until 2019/12/31 volume: 102 issue: 4.)
ProQuest SciTech Premium Collection
(Available from 2001/02/01 volume: 84 issue: 1 until 2019/12/31 volume: 102 issue: 4.)
PubMed Central
(Available from 1999 volume: 82.)
SAGE Open Access Journals
(Available from 1999/02/01 volume: 82 issue: 1.)