TY - PROGRESS IN GEOGRAPHY A1 - LIU Litao, SHEN Lei, LIU Xiaojie T1 - Theories, Methods and Progress of Energy Security Research Y1 - 2012-04-25 00:00:00.0 JF - PROGRESS IN GEOGRAPHY JO - PROGRESS IN GEOGRAPHY SP - 403 EP - 411 VL - 31 IS - 4 UR - {https://www.progressingeography.com/EN/10.11820/dlkxjz.2012.04.002} N1 - 10.11820/dlkxjz.2012.04.002 ER -