Spectral Temporal Graph Neural Network for Multivariate Time-series Forecasting - Cao, Defu; Wang, Yujing; Duan, Juanyong; Zhang, Ce; Zhu, Xia; Huang, Congrui; Tong, Yunhai; Xu, Bixiong; Bai, Jing; Tong, Jie; Zhang, Qi (Advances in Neural Information Processing Systems, 2020)