TY - Acta Geographica Sinica A1 - Wang Yiming T1 - SOME THEORETICAL PROBLEMS ABOUT THE DEVELOPMENT IN UNDERDEVELOPED REGIONS Y1 - 1993-11-15 00:00:00.0 JF - Acta Geographica Sinica JO - Acta Geographica Sinica SP - 497 EP - 504 VL - 48 IS - 6 UR - {https://www.geog.com.cn/EN/10.11821/xb199306003} N1 - 10.11821/xb199306003 ER -