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Katrin Wisniewski, Karin Schöne, Lionel Nicolas, Chiara Vettori, Adriane Boyd, Detmar Meurers, Andrea Abel, Jirka Hana (2013): MERLIN: An Online Trilingual Learner Corpus Empirically Grounding the European Reference Levels in Authentic Learner . In: Conference proceedings. ICT for language learning, pp. 1-5, libreriauniversitaria.it, Firenze, Italy, ISBN 978-88-6292-423-8 (pdf, bibtex)