Lowalekar, M., P. Varakantham, S. Ghosh, S. Jena, and P. Jaillet. “Online Repositioning in Bike Sharing Systems”. Proceedings of the International Conference on Automated Planning and Scheduling, vol. 27, no. 1, June 2017, pp. 200-8, doi:10.1609/icaps.v27i1.13824.