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Andrea Abel, Katrin Wisniewski, Lionel Nicolas, Adriane Boyd, Jirka Hana, Detmar Meurers (2014): A Trilingual Learner Corpus illustrating European Reference Levels. In: RiCOGNIZIONI. Rivista di lingue, letterature e culture moderne, ISSN 2384-8987, 2, pp. 111-126 (url, bibtex)