TY - Front. Hist. China A1 - ZHANG Guogang T1 - The transformations of the Tang military system and social changes in medieval China Y1 - 2007-09-05 JF - Frontiers of History in China JO - Front. Hist. China SP - 293 EP - 319 VL - 2 IS - 3 UR - https://journal.hep.com.cn/fhc N1 - 10.1007/s11462-007-0018-4 ER -