@article{GU Jie_1332, author = {GU Jie, ZHOU Suhong,YAN Xiaopei, CHAI Yanwei, ZHENG Zhong}, title = {The trend and hot issues in the field of space-time research: Based on the literature citation relationships and knowledge map}, publisher = {PROGRESS IN GEOGRAPHY}, year = {2013}, journal = {PROGRESS IN GEOGRAPHY}, volume = {32}, number = {9}, eid = {1332}, pages = {1332-1343}, keywords = {space-time;knowledge map;time geography;progress;hot spots of research}, doi = https://www.progressingeography.com/EN/10.11820/dlkxjz.2013.09.003 }