Schulz08'

@inproceedings{DBLP:conf/automata/Schulz08,
  author    = {Matthias Schulz},
  title     = {How far is to the next recurrent configuration? An NP-complete
               problem in the sandpile model},
  booktitle = {Automata},
  year      = {2008},
  pages     = {253-269},
  ee        = {http://uncomp.uwe.ac.uk/free-books/automata2008reducedsize.pdf},
  crossref  = {DBLP:conf/automata/2008},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

@proceedings{DBLP:conf/automata/2008,
  editor    = {Andrew Adamatzky and
               Ram{\'o}n Alonso-Sanz and
               Anna T. Lawniczak and
               Genaro Ju{\'a}rez Mart\'{\i}nez and
               Kenichi Morita and
               Thomas Worsch},
  title     = {Automata 2008: Theory and Applications of Cellular Automata,
               Bristol, UK, June 12-14, 2008},
  publisher = {Luniver Press, Frome, UK},
  year      = {2008},
  isbn      = {978-1-905986-16-3},
  ee        = {http://uncomp.uwe.ac.uk/free-books/automata2008reducedsize.pdf},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}