Content Provider
University of Washington, Seattle: Digital Collections
3
Arca (BC's Digital Treasures)
2
Digital.CSIC (Spanish National Research Council)
2
North Dakota State University (NDSU): Digital Horizons
2
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
1
CQUniversity: acquire
1
Central Queensland University: aCQUIRe
1
Columbia University: Academic Commons
1
DataCite Metadata Store (German National Library of Science and Technology)
1
Digital Commons @ St. Norbert College
1
I-Revues (E-Journals, INIST-CNRS)
1
Indiana University Libraries Digital Projects & Services
1
Lund University Publications (LUP)
1
Naval Postgraduate School: Calhoun
1
Repositório Institucional da Universidade de Aveiro (RIA)
1
University of Groningen research database
1
Unknown
1
Vrije Universiteit Amsterdam (VU): Research Portal
1