Klüver, HeikeHeikeKlüverSaurugger, SabineSabineSaurugger2019-09-192013-08-1420132047-7422https://fis.uni-bamberg.de/handle/uniba/1979engOpening the black box: The professionalization of interest groups in the European Unionarticlehttp://www.palgrave-journals.com/iga/journal/v2/n2/pdf/iga20132a.pdf