平台:
DOAJ Directory of Open Access Journals
(Available from 2008 until 2016.)
ProQuest SciTech Premium Collection
(Available from 2008/01/01 until 2016/12/31. Available from 2019/01/01.)
DOAJ Directory of Open Access Journals
(Available from 2008 until 2016.)
ProQuest SciTech Premium Collection
(Available from 2008/01/01 until 2016/12/31. Available from 2019/01/01.)