Brunni, Sisko, Liisa-Maria Lehto, Jarmo Jantunen, and Valtteri Airaksinen. “How to Annotate Morphologically Rich Learner Language. Principles, Problems and Solutions”. Bergen Language and Linguistics Studies 6 (May 30, 2015). Accessed July 11, 2020. https://bells.uib.no/index.php/bells/article/view/812.