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平台:
EBSCOhost Academic Search Complete
(Available from 2002/01/01.)
EBSCOhost Science Reference Center
(Available from 2002/01/01.)
EBSCOhost STM Source
(Available from 2002/01/01.)
ProQuest SciTech Premium Collection
(Available from 1997/11/01 volume: 21 issue: 11 until 2007/10/31 volume: 31 issue: 10.)