• [1]

    . Augueres J L, Aymar R, Bon Mardion G et al. Cryogenics,1980, 9: 5292. Aymar R, Genevey P, Palanque S et al. Cryogenics, 1980,9: 5213. LIU Hua-Jun, WU Yu, CHEN Jing-Lin et al. Cryogenics and Superconductivity, 2009, 37: 24 (in Chinese)4. LONG Feng, CHEN Zhuo-Min, CHEN Fei-Yun. Chinese Journal of Low Temperature Physics, 2007, 29: 123 (in Chinese)5. YU Xiao-Yan, LI Jing-Dong, TANG Yao-Jin et al. High Voltage Apparatus, 2003, 39: 47 (in Chinese)