Lelis, L., Stern, R., Felner, A., Zilles, S. and Holte, R. 2012. Predicting Optimal Solution Cost with Bidirectional Stratified Sampling. Proceedings of the International Conference on Automated Planning and Scheduling. 22, 1 (May 2012), 155-163. DOI:https://doi.org/10.1609/icaps.v22i1.13512.