Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
345
Zenodo
76
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
2
Directory of Open Access Journals: DOAJ Articles
2
Unknown
2
HELDA – University of Helsinki Open Repository
1
Pensoft Publishers
1
Utah State University: DigitalCommons@USU
1