Zhang, C. ., Li, Y. ., Bao, J. ., Ruan, S. ., He, T. ., Lu, H. ., … Li, X. . (2019). Effective Recycling Planning for Dockless Sharing Bikes. In the 27th ACM SIGSPATIAL International Conference on Advances in Geographic Information Systems (p. 9). http://doi.org/10.1145/3347146.3359340