@inproceedings{frank08rareevents
   author = {J. Frank and S. Mannor and D. Precup},
   title = {Reinforcement learning in the presence of rare events},
   booktitle = {Proceedings of the 25th Annual International Conference on Machine Learning (ICML 2008)},
   location = {Helsinki, Finland},
   editor = {Andrew McCallum and Sam Roweis},
   publisher = {Omnipress},
   year = {2008},
   pages = {336--343}
}