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What is ethnicity and how is it linked to language? - phenomenological and socio-historical considerations language maintenance and language shift in ethnocultural perspective the ethnic dimension in language planning language and ethnicity in education - the bilingual minority focus elites and rank-and-file - contrasts and contexts in ethnolinguistic behaviour and attitudes ethnolinguistic homogeneity and heterogeneity - worldwide causes, consequences and aspirations.
Bills et al. (Mon,) studied this question.