@InProceedings{console_et_al:LIPIcs.ICDT.2019.8,
  author =	{Console, Marco and Guagliardo, Paolo and Libkin, Leonid},
  title =	{{Fragments of Bag Relational Algebra: Expressiveness and Certain Answers}},
  booktitle =	{22nd International Conference on Database Theory (ICDT 2019)},
  pages =	{8:1--8:16},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-101-6},
  ISSN =	{1868-8969},
  year =	{2019},
  volume =	{127},
  editor =	{Barcelo, Pablo and Calautti, Marco},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ICDT.2019.8},
  URN =		{urn:nbn:de:0030-drops-103106},
  doi =		{10.4230/LIPIcs.ICDT.2019.8},
  annote =	{Keywords: bag semantics, relational algebra, expressivity, certain answers, complexity}
}