Proceedings of the 4th Workshop on Argument Mining Ivan Habernal editor Iryna Gurevych editor Kevin Ashley editor Claire Cardie editor Nancy Green editor Diane Litman editor Georgios Petasis editor Chris Reed editor Noam Slonim editor Vern Walker editor 2017-09 Association for Computational Linguistics Copenhagen, Denmark text conference publication ws-2017-argument https://aclanthology.org/W17-5100/