„The correlation between ethno-lingual classroom composition and reading achievement appears to be associated with the presence of classmates who share the same minority language rather than the proportion of minority language students per se.“
Julian Seuring u. a., Ethnic Classroom Composition and Minority Language Use among Classmates: Do Peers Matter for Students’ Language Achievement? In: European Sociological Review, 2020, Vol. 36, No. 6, S. 932.