%0 Journal Article %T Perturbed Masking: Parameter-free Probing for Analyzing and Interpreting BERT %A Wu, Zhiyong %A Chen, Yun %A Kao, Ben %A Liu, Qun %A , %J Proceedings of the 58th Annual Meeting of the Association for Computational Linguistics %D 2020-01-01 %I Association for Computational Linguistics %~ DeepDyve