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  Google Scholar

  http://scholar.google.de/scholar?q=powertower

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  Category:Systems dynamics – Wikimedia Commons

  https://commons.wikimedia.org/wiki/Category:Systems_dynamics?uselang=de

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  Oil Abundance and Economic Growth - Elkhan Richard Sadik-Zada - Google Books

  https://books.google.de/books?id=ULWQDQAAQBAJ&pg=PA168&lpg=PA168&dq=oil+abundance+and+economic+growth+elkhan&source=bl&ots=MH2qx

  This book deals with the role of oil abundance in economic growth. The major theoretical contribution of the analysis is the transformation of the rentier state theory into the language of mathematical economics. The mathematical formalization of the…

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