@article{Xiaolu GAO_280, author = {Xiaolu GAO, Zening XU, Fangqu NIU}, title = {Delineating the scope of urban agglomerations based upon the Pole-Axis theory}, publisher = {PROGRESS IN GEOGRAPHY}, year = {2015}, journal = {PROGRESS IN GEOGRAPHY}, volume = {34}, number = {3}, eid = {280}, pages = {280-289}, keywords = {city boundary;Pole-Axis theory;Densi-Graph;centricity;regional development}, doi = https://www.progressingeography.com/EN/10.11820/dlkxjz.2015.03.003 }