4DGCPro: Efficient Hierarchical 4D Gaussian Compression for Progressive Volumetric Video Streaming - Zheng, Zihan; Wu, Zhenlong; Zhong, Houqiang; Tian, Yuan; Cao, Ning; Xu, Lan; Yao, Jiangchao; Zhang, Xiaoyun; Hu, Qiang; Zhang, Wenjun (Advances in Neural Information Processing Systems, 2025)