Backtracking: Garbage collection

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\begin{bibtex} @article{DBLP:journals/sigart/HoebelW99a,

 author    = {Louis J. Hoebel and
              Christopher A. Welty},
 title     = {Backtracking: Garbage collection},
 journal   = {Intelligence},
 volume    = {10},
 number    = {2},
 year      = {1999},
 pages     = {48},
 ee        = {http://doi.acm.org/10.1145/309697.309710},
 bibsource = {DBLP, http://dblp.uni-trier.de}

}

\end{bibtex}