Cai, Z., Li, M., Huang, W. and Yang, W. 2021. BT Expansion: a Sound and Complete Algorithm for Behavior Planning of Intelligent Robots with Behavior Trees. Proceedings of the AAAI Conference on Artificial Intelligence. 35, 7 (May 2021), 6058-6065. DOI:https://doi.org/10.1609/aaai.v35i7.16755.