Unraveling the mystery of U-shaped valleys and asymmetric drainage in the Songnen Basin: A case study of tectonic-glacial superimposition - Ke Yang; Fubing He; Junbo Yu; Yangyang Chen; Kaiming Wang; Zhiwei Yang; Shaozhong Qiao; Jiayu Wang; Xinyi Wang; Juechang Wan; Yubin Cui; Jiahong Wu (Geomorphology, 2026)