Heckmann, FriedrichFriedrichHeckmann2019-09-192015-07-131998https://fis.uni-bamberg.de/handle/uniba/38223engAnalysis of national modes of immigrant integration: Germanyworkingpaperhttps://web.archive.org/web/20040519042619/http://www.uni-bamberg.de/~ba6ef3/pdf/efms_p27.pdf