Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
601
University of Central Florida (UCF): STARS (Showcase of Text, Archives, Research & Scholarship)
2
Cambridge University Press
1
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy)
1
University of Calgary Journal Hosting
1
University of North Texas: UNT Digital Library
1
Wiley Online Library
1