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Die Problematik des Osthandels
Auerbach, Ludwig, (1964)
Europas Zukunft zwischen Ost und West
Brown, James F., (1971)
The European Community and Eastern Europe
Ransom, Charles, (1973)
ECE energy series
(2013)
Transboundary air pollution : effects and control
(1986)
Gas networks in Europe : interconnection and extension
(1993)