@article{DBLP:journals/mst/KaminskiK18,
  title = "Complexity and Expressive Power of Weakly Well-Designed {SPARQL}",
  author = "Mark Kaminski and Egor V. Kostylev",
  year = "2018",
  journal = "Theory Comput. Syst.",
  number = "4",
  pages = "772--809",
  url = "https://doi.org/10.1007/s00224-017-9802-9",
  volume = "62",
  doi = "10.1007/s00224-017-9802-9",
}