@Inproceedings{EPTCS81.4,
  author    = { Veloso, Paulo A. S. and Veloso, Sheila R. M. },
  year      = {2012},
  title     = {On Graph Refutation for Relational Inclusions},
  editor    = {Rocca, Simona Ronchi della  and Pimentel, Elaine},
  booktitle = {{\rm Proceedings 6th Workshop on}
               Logical and Semantic Frameworks with Applications,
               {\rm Belo Horizonte, Brazil, 27 August 2011}},
  series    = {Electronic Proceedings in Theoretical Computer Science},
  volume    = {81},
  publisher = {Open Publishing Association},
  pages     = {47-62},
  doi       = {10.4204/EPTCS.81.4},
}