@InProceedings{braultbaron:LIPIcs.CSL.2012.137,
  author =	{Brault-Baron, Johann},
  title =	{{A Negative Conjunctive Query is Easy if and only if it is Beta-Acyclic}},
  booktitle =	{Computer Science Logic (CSL'12) - 26th International Workshop/21st Annual Conference of the EACSL},
  pages =	{137--151},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-939897-42-2},
  ISSN =	{1868-8969},
  year =	{2012},
  volume =	{16},
  editor =	{C\'{e}gielski, Patrick and Durand, Arnaud},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.CSL.2012.137},
  URN =		{urn:nbn:de:0030-drops-36697},
  doi =		{10.4230/LIPIcs.CSL.2012.137},
  annote =	{Keywords: conjunctive query, hypergraph, beta-acyclicity, data complexity, Davis-Putnam procedure}
}