@InProceedings{kaminski_et_al:LIPIcs.ICDT.2016.5,
  author =	{Kaminski, Mark and Kostylev, Egor V.},
  title =	{{Beyond Well-designed SPARQL}},
  booktitle =	{19th International Conference on Database Theory (ICDT 2016)},
  pages =	{5:1--5:18},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-002-6},
  ISSN =	{1868-8969},
  year =	{2016},
  volume =	{48},
  editor =	{Martens, Wim and Zeume, Thomas},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ICDT.2016.5},
  URN =		{urn:nbn:de:0030-drops-57744},
  doi =		{10.4230/LIPIcs.ICDT.2016.5},
  annote =	{Keywords: RDF, Query languages, SPARQL, Optional matching}
}