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3. De Lange Golf in de Economie: Kan Innovatie uns uit het dal Helpen?;van Duijn,1979
4. J. Clark, C. Freeman, and L. Soete, “Long waves and technological developments in the 20th century”, paper prepared for the Bochum Conference on “Wirtschaftliche Wechsellagen und Sozialer Wandel 1980”, to be pub