Schönwälder, Karen Socio-Cultural Diversity, MPI for the Study of Religious and Ethnic Diversity, Max Planck Society;
https://www.berghahnjournals.com/view/journals/gps/30/1/gps300104.xml (Any fulltext)
Schönwälder, K., & Triadafilopoulos, T. (2012). A bridge or barrier to incorporation? Germany's 1999 citizenship reform in critical perspective. German Politics and Society, 30(1), 52-70. doi:10.3167/gps.2012.300104.