pdGRASS: A Fast Parallel Density-Aware Algorithm for Graph Spectral Sparsification - Zhao, Tiancheng; Yin, Zekun; An, Huihai; Yang, Xiaoyu; Jin, Zhou; Shen, Jiasi; Xu, Helen (2025 IEEE High Performance Extreme Computing Conference (HPEC), High Performance Extreme Computing Conference (HPEC), 2025 IEEE, 2025)