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Springer Nature
102
Springer Nature (via Crossref)
77
The Open University: Open Research Online (ORO)
1
The University of Milan: Archivio Istituzionale della Ricerca (AIR)
1
UNC Press (The University of North Carolina - via Crossref)
1
UNESDOC - UNESCO Digital Library
10
Universidad de Las Palmas de Gran Canaria: Acceda
1
University College London: UCL Discovery
1
University of California Press (via Crossref)
2
University of Cambridge, Department of Earth Sciences: ESC Publications
1
University of Greenwich: Greenwich Academic Literature Archive
1
University of Lapland: Lauda
2
University of South Florida St. Petersburg: Digital USFSP
1
University of Southampton: e-Prints Soton
7
University of St. Gallen: Research Platform Alexandria
1
University of Sussex: Sussex Research Online
1
University of Toronto Press (U Toronto Press - via Crossref)
1
University of Tromsø: Munin Open Research Archive
2
University of Wollongong, Australia: Research Online
2
University of Zurich (UZH): ZORA (Zurich Open Repository and Archive
1
University of the Highlands and Islands: Research Database of UHI
2
Università degli Studi di Genova: CINECA IRIS
1
Università degli Studi di Siena: USiena air
1
Università degli studi di Torino: AperTo (Archivio Istituzionale ad Accesso Aperto)
1
Universitá degli Studi di Roma "Tor Vergata": ART - Archivio Istituzionale della Ricerca
1
Université Grenoble Alpes: HAL
2
Université de Nantes: HAL-UNIV-NANTES
2
Université de Poitiers: Publications de nos chercheurs.ses (HAL)
1
Unknown
1
Uppsala University: Publications (DiVA)
1
Utrecht University Repository
7
Vrije Universiteit Amsterdam (VU): Research Portal
1
Wageningen UR (University & Research Centre): Digital Library
2
Wiley Online Library (via Crossref)
5
ZFDM Repository (Center for Sustainable Research Data Management, Hamburg University)
1