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2. 7) http://www.transport-research.info/web/projects/project_details.cfm?id=11198
3. 8) http://www.transport-research.info/web/projects/project_details.cfm?id=35092
4. 9) http://magnesium-elektron.com
5. 13) http://www.kumamoto-u.ac.jp/organizations/kico/news/20141110