•
平台:
DOAJ Directory of Open Access Journals
(Available from 2006.)
IOP (Institute of Physics) OA期刊
(Available from 2006/10/01 volume: 1 issue: 1.)
ProQuest Agricultural & Environmental Science Database
(Available from 2006/10/01.)
ProQuest SciTech Premium Collection
(Available from 2006/10/01.)