TimeXer: Empowering Transformers for Time Series Forecasting with Exogenous Variables - Wang, Yuxuan; Wu, Haixu; Dong, Jiaxiang; Qin, Guo; Zhang, Haoran; Liu, Yong; Qiu, Yunzhong; Wang, Jianmin; Long, Mingsheng (Advances in Neural Information Processing Systems, 2024)