Argument Search: Assessing Argument Relevance - Potthast, Martin; Gienapp, Lukas; Euchner, Florian; Heilenkötter, Nick; Weidmann, Nico; Wachsmuth, Henning; Stein, Benno; Hagen, Matthias (42nd International ACM Conference on Research and Development in Information Retrieval (SIGIR 2019))