@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-dev.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}
}