discoursegraphs: A graph-based merging tool and converter for multilayer annotated corpora Arne Neumann author 2015-05 text Proceedings of the 20th Nordic Conference of Computational Linguistics (NODALIDA 2015) Beáta Megyesi editor Linköping University Electronic Press, Sweden Vilnius, Lithuania conference publication neumann-2015-discoursegraphs https://aclanthology.org/W15-1843/ 2015-05 309 312