Beeks, M., R. Refaei Afshar, Y. Zhang, R. Dijkman, C. van Dorst, and S. de Looijer. “Deep Reinforcement Learning for a Multi-Objective Online Order Batching Problem”. Proceedings of the International Conference on Automated Planning and Scheduling, vol. 32, no. 1, June 2022, pp. 435-43, doi:10.1609/icaps.v32i1.19829.