Sebastiani, Eugenio, Raphaël Lallement, Rachid Alami, and Luca Iocchi. 2017. “Dealing With On-Line Human-Robot Negotiations in Hierarchical Agent-Based Task Planner”. Proceedings of the International Conference on Automated Planning and Scheduling 27 (1):549-57. https://doi.org/10.1609/icaps.v27i1.13862.