for solving reasoning problems in abstract argumentation – A survey Günther Charwat a , Wolfgang Dvoˇrák b , Sarah A. Gaggl c , Johannes P. Wallner a , Stefan Woltran a,∗ a Vienna University of Technology, Institute of Information Systems, Austria b University of Vienna, Faculty of Computer Science, Austria c Technische Universität Dresden, Institute of Artificial Intelligence, Germany a r t i c l e i n f o a b s t r a c t Article history: Received 29 March 2013 Received in revised form 19 November 2014 Accepted 28 November 2014 Available online 15 December 2014