Experimental Study of a Helium Sorption Cooler with Low Temperature Fluctuation and Long Hold Time below 1 K. - Liu, Tianshuo; Cui, Xiaoyu; Lu, Lihao; Ying, Kongkuai; Wang, Yang; Liu, Kangjun; Wang, Zilong; Jiang, Zhenhua; Liu, Shaoshuai (Frontiers in Heat & Mass Transfer, 2025)