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- Aerospace Database
- BASE (Bielefeld Academic Search Engine)
- CNKI Scholar
- DTU Library
- Elektronische Zeitschriftenbibliothek (EZB)
- EuroPub Database
- Excellence in Research for Australia (ERA)
- Google Scholar
- Harvard Library
- PKP Open Archives Harvester
- Standard Periodical Directory
- Technische Informationsbibliothek (TIB)
- UCR Library
- Wendy SmithEditorial Assistant