XQA: A Cross-lingual Open-domain Question Answering Dataset Jiahua Liu author Yankai Lin author Zhiyuan Liu author Maosong Sun author 2019-07 text Proceedings of the 57th Annual Meeting of the Association for Computational Linguistics Anna Korhonen editor David Traum editor Lluís Màrquez editor Association for Computational Linguistics Florence, Italy conference publication liu-etal-2019-xqa 10.18653/v1/P19-1227 https://aclanthology.org/P19-1227/ 2019-07 2358 2368