Space self-adaption global variance Reduction(SsGVR) method for large-scale radiation shielding calculation - Jichong Lei; Zhenping Chen; Zhiqiang Peng; Zining Ni; Jun Hong; Hong Hu; Xiaoyong Fang; Cannan Yi; Changan Ren; Muhammad Abdul Wasaye; Tao Yu (Annals of Nuclear Energy, 2025)