Indexed by:
- CaRLO
- CrossRef
- DRJI
- Electronic Journals Library
- GetCited
- Google Scholar
- ISURS
- Library of Congress
- Linkedwords
- NewJour
- Open Access Journals
- PKP
- Research Bible
- Scientific Index
- SCIRUS
- SHERPA/RoMEO
- Tu Clausthal
- Ubl
- UH
- WZB
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