Backtracking: the eternal flame

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\begin{bibtex} @article{DBLP:journals/sigart/Welty01,

 author    = {Christopher A. Welty},
 title     = {Backtracking: the eternal flame},
 journal   = {Intelligence},
 volume    = {12},
 number    = {1},
 year      = {2001},
 pages     = {39-40},
 ee        = {http://doi.acm.org/10.1145/376451.376470},
 bibsource = {DBLP, http://dblp.uni-trier.de}

}

\end{bibtex}