ScienceDirect
2021-07-01 ~ 현재
DOAJ: Directory of Open Access Journals
2021-01-01 ~ 현재
ScienceDirect Open Access Titles
2021-07-01 ~ 현재
ScienceDirect
2024
DOAB Directory of Open Access Books
2025
EBSCO Open Access Journals
2025-01-01 ~ 현재
DOAB Directory of Open Access Books
2024
DOAB Directory of Open Access Books
2012
DOAB Directory of Open Access Books
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ScienceDirect
1953
ScienceDirect
2015
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2016