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This subject was discussed by Professor Dr Hans A. Have-menn in a lecture which he gave on October 1, at a meeting of the Study Group Nordrhein Westfalen. The article is an abbreviated and slightly revised version, which will be published by the “Westdeutsche Verlag” in the Study Group’s series of papers.
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Havemann, H.A., Hubertus, S. New aspects of research on DC’s. Intereconomics 5, 119–122 (1970). https://doi.org/10.1007/BF02929759
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DOI: https://doi.org/10.1007/BF02929759