@inproceedings{ DBLP:conf/ijcai/BacchusY91, title = {The Downward Refinement Property} } , url = {DRPBacchusYang1991.pdf} } , booktitle = {Proceedings of the 12th International Joint Conference on Artificial Intelligence (IJCAI-1991)} } , author = {Fahiem Bacchus and Qiang Yang} } , area = {Planning (including under Uncertainty)} } , year = {1991} } , bibsource = {DBLP http://dblp.uni-trier.de} } , pages = {286-293} }