TY - GEOGRAPHICAL RESEARCH A1 - T1 - Y1 - 2009-08-28 00:00:00.0 JF - GEOGRAPHICAL RESEARCH JO - GEOGRAPHICAL RESEARCH SP - 1 EP - VL - 1 IS - 1 UR - {https://www.dlyj.ac.cn/EN/10.11821/yj2009010002} N1 - 10.11821/yj2009010002 ER -