Backtracking: robots that fly, part II

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\begin{bibtex} @article{DBLP:journals/sigart/Welty00,

 author    = {Christopher A. Welty},
 title     = {Backtracking: robots that fly, part II},
 journal   = {Intelligence},
 volume    = {11},
 number    = {3},
 year      = {2000},
 pages     = {56},
 ee        = {http://doi.acm.org/10.1145/350752.350769},
 bibsource = {DBLP, http://dblp.uni-trier.de}

}

\end{bibtex}