Backtracking

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\begin{bibtex} @article{DBLP:journals/sigart/WeltyH00,

 author    = {Christopher A. Welty and
              Louis J. Hoebel},
 title     = {Backtracking},
 journal   = {Intelligence},
 volume    = {11},
 number    = {1},
 year      = {2000},
 pages     = {60},
 ee        = {http://doi.acm.org/10.1145/333175.333183},
 bibsource = {DBLP, http://dblp.uni-trier.de}

}

\end{bibtex}