Folsom-Kovarik, J. et al. 2021. Integrating Learner Help Requests Using a POMDP in an Adaptive Training System. Proceedings of the AAAI Conference on Artificial Intelligence. 26, 2 (Oct. 2021), 2287–2292. DOI:https://doi.org/10.1609/aaai.v26i2.18971.