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1. |
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Teachability and Learnability across Languages

Arntzen Ragnar Arntzen, Hakansson Gisela Hakansson, Hjelde Arnstein Hjelde, Keler Jorg-U Keler
E-bok. John Benjamins Publishing Company, 2019.
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2. |
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Developing, Modelling and Assessing Second Languages

Jorg-U Keler, Anke Lenzing, Mathias Liebner
E-bok. John Benjamins Publishing Company, 2016.
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3. |
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Studying Processability Theory

Pienemann Manfred Pienemann, Keler Jorg-U Keler
E-bok. John Benjamins Publishing Company, 2011.
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