Dvořák, Wolfgang, Markus Ulbricht, and Stefan Woltran. 2021. “Recursion in Abstract Argumentation Is Hard --- On the Complexity of Semantics Based on Weak Admissibility”. Proceedings of the AAAI Conference on Artificial Intelligence 35 (7):6288-95. https://doi.org/10.1609/aaai.v35i7.16781.