Aziz, H., Elkind, E., Huang, S., Lackner, M., Sanchez-Fernandez, L., & Skowron, P. (2018). On the Complexity of Extended and Proportional Justified Representation. Proceedings of the AAAI Conference on Artificial Intelligence, 32(1). Retrieved from https://ojs.aaai.org/index.php/AAAI/article/view/11478