Content Provider
University of North Texas: UNT Digital Library
4
DataCite Metadata Store (German National Library of Science and Technology)
1
Directory of Open Access Journals: DOAJ Articles
1
Electrical Engineering and Power Engineering (EE&PE - E-Journal)
1
NORA (National aggregator of open repositories of Russian universities)
1
Old Dominion University: ODU Digital Commons
1
Scientific Periodicals of Ukraine (Ukrainian Research and Academic Network)
1
Universitat Politècnica de Catalunya (UPC): Theses and Dissertations Online (TDX)
1
Universitat Politècnica de Catalunya, BarcelonaTech: UPCommons - Global access to UPC knowledge
1
University of Michigan: Deep Blue
1
University of Tyumen: UTMN Repository
1
Zenodo
1