1. Cryogenic cooling system of HTS transformers by natural convection of subcooled liquid nitrogen;Chang;Cryogenics,2003
2. Natural convection of subcooled liquid nitrogen in a vertical cavity;Choi;Adv Cryo Eng,2002
3. Yazawa T, Ohtani Y, Kuriyama T, Nomura S, Okuma T, Hobara N, Takahashi Y, Inoue K. 66kV-class superconducting fault current limiter magnet-subcooled nitrogen cryostat. In: Proceedings of 19th international cryogenic engineering conference, Narosa, New Delhi, 2002. p. 261–4.
4. Subcooled liquid nitrogen refrigerator for HTS power systems;Suzuki;Cryogenics,2003
5. Sub-cooled nitrogen cryogenic cooling system for superconducting fault current limiter by using GM-cryocooler;Kang;Cryogenics,2005