@inproceedings{conf/www/KaminskiKCG16,
  title = "Semantics and expressive power of subqueries and aggregates in {SPARQL} 1.1",
  author = "Mark Kaminski and Egor V. Kostylev and Bernardo {Cuenca Grau}",
  year = "2016",
  booktitle = "Proceedings of the 25th International Conference on World Wide Web ({WWW} 2016), Montreal, Canada, April 11-15, 2016",
  pages = "227--238",
  publisher = "{ACM}",
}