Dvořák, Wolfgang, and Stefan Woltran. “Complexity of Abstract Argumentation under a Claim-Centric View”. Proceedings of the AAAI Conference on Artificial Intelligence 33, no. 01 (July 17, 2019): 2801-2808. Accessed April 16, 2021. https://ojs.aaai.org/index.php/AAAI/article/view/4132.