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Journal Article Sources of Variability in Interlanguage Get access ROD ELLIS ROD ELLIS Ealing College of Higher Education Search for other works by this author on: Oxford Academic Google Scholar Applied Linguistics, Volume 6, Issue 2, 1985, Pages 118–131, https://doi.org/10.1093/applin/6.2.118 Published: 01 August 1985
Rod Ellis (Fri,) studied this question.