Berker, Ratip Emin, et al. “On the Edge of Core (Non-)Emptiness: An Automated Reasoning Approach to Approval-Based Multi-Winner Voting”. Proceedings of the AAAI Conference on Artificial Intelligence, vol. 40, no. 20, Mar. 2026, pp. 16673-81, doi:10.1609/aaai.v40i20.38709.