Learning to search: from weak methods to domain-specific heuristics. Langley, P. Cognitive Science, 9:217-260, 1985.
bibtex   
@article{Langley:85,
author = {P. Langley},
title ={Learning to search: from weak methods to domain-specific heuristics},
journal={Cognitive Science},
volume = {9},
pages={217-260},
year   = {1985}}
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