Attack of the Tails: Yes, You Really Can Backdoor Federated Learning - Wang, Hongyi; Sreenivasan, Kartik; Rajput, Shashank; Vishwakarma, Harit; Agarwal, Saurabh; Sohn, Jy-yong; Lee, Kangwook; Papailiopoulos, Dimitris (Advances in Neural Information Processing Systems, 2020)