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平台:
DOAJ Directory of Open Access Journals
(Available from 1955 until 2017.)
Elsevier SD Journals - AutoHoldings
(Available from 2013/01/01 volume: 58 issue: 217 until 2017/12/31 volume: 62 issue: 231.)
ProQuest Political Science Database
(Available from 2012/01/01.)