Paper  bibtex   

@article{DBLP:journals/corr/abs-cs-0507059,
  author    = {Magdalena Ortiz and
               Diego Calvanese and
               Thomas Eiter and
               Enrico Franconi},
  title     = {Data complexity of answering conjunctive queries over {SHIQ} knowledge
               bases},
  journal   = {CoRR},
  volume    = {abs/cs/0507059},
  year      = {2005},
  url       = {http://arxiv.org/abs/cs/0507059},
  archivePrefix = {arXiv},
  eprint    = {cs/0507059},
  timestamp = {Wed, 07 Jun 2017 01:00:00 +0200},
  biburl    = {https://dblp.org/rec/bib/journals/corr/abs-cs-0507059},
  bibsource = {dblp computer science bibliography, https://dblp.org}
}