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Teadus
Estland / Statistikaamet - Tallinn : ESA - 1994(1995) - 1999(2000)
Persistent link: https://www.econbiz.de/10000586551
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Teadus- ja arendustegevus
Estland / Statistikaamet - Tallinn - 2000(2001) - 2006(2008); damit Ersch. eingest.
Persistent link: https://www.econbiz.de/10001644009