Fix and extend Dataset Sources

- use hdl.net PID (instead of direct link to repository)
- add link to GitLab version controlled data source
- fix paper reference

README.md

@@ -34,10 +34,10 @@ The MERLIN corpus contains 2,286 texts for learners of Italian, German and Czech
 
 ### Dataset Sources
 
-- **Repository:** https://clarin.eurac.edu/repository/xmlui/handle/20.500.12124/6
-- **Paper:** Wisniewski, Katrin; Abel, Andrea; Vodičková, Kateřina; et al., 2018, 
-  MERLIN Written Learner Corpus for Czech, German, Italian 1.1, Eurac Research CLARIN Centre, 
-  http://hdl.handle.net/20.500.12124/6.
+- **Data PID:** https://hdl.handle.net/20.500.12124/6
+- **Verion controlled data (Git):** https://gitlab.inf.unibz.it/commul/merlin-platform/data-bundle
+- **Paper:** Boyd, A., Hana, J., Nicolas, L., Meurers, D., Wisniewski, K., Abel, A., Schöne, K., Štindlová, B., & Vettori, C. (2014). The MERLIN corpus: Learner language and the CEFR. Proceedings of the 9th International Conference on Language Resources and Evaluation (LREC 14), 26-31 May 2014, 1281–1288.  
+  http://www.lrec-conf.org/proceedings/lrec2014/summaries/606.html.
 
 ## Uses