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R Coppieters . (1987). Competence differences between native and near-native speakers. Language, 63, 544–573.
L. M Goldstein . (1987). Standard English: The only target for nonnative speakers of English? TESOL Quarterly, 21, 417–436.
R Quirk . (1981). International communication and the concept of nuclear English. In L. E. Smith (Ed.), English for cross-cultural communication (pp. 151–165). London: Macmillan.