Heckmann, FriedrichFriedrichHeckmann2019-09-192015-07-131999https://fis.uni-bamberg.de/handle/uniba/38201engIntegration policies in Europe: national difference or convergence?workingpaperhttps://web.archive.org/web/20040519085858/http://www.uni-bamberg.de/~ba6ef3/pdf/efms_p33.pdf