Garrett, C. R., T. Lozano-Pérez, and L. P. Kaelbling. “PDDLStream: Integrating Symbolic Planners and Blackbox Samplers via Optimistic Adaptive Planning”. Proceedings of the International Conference on Automated Planning and Scheduling, vol. 30, no. 1, June 2020, pp. 440-8, doi:10.1609/icaps.v30i1.6739.