Sun, Y., Fan, H., Li, M., & Zipf, A. (2016). Identifying the city center using human travel flows generated from location-based social networking data. Environment and Planning B: Planning and Design, 43(3), pp. 480-498. doi:10.1177/0265813515617642

Sun, Yeran, Hongchao Fan, Ming Li, and Alexander Zipf. "Identifying the City Center Using Human Travel Flows Generated From Location-based Social Networking Data." Environment and Planning B: Planning and Design 43, no. 3 (2016): 480-498.

Sun, Yeran, Hongchao Fan, Ming Li, and Alexander Zipf. "Identifying the City Center Using Human Travel Flows Generated From Location-based Social Networking Data." Environment and Planning B: Planning and Design 43.3 (2016): 480-498.