@article{KnowledgeBase,
  title = "A Knowledge Base for the Maintenance of Knowledge Extracted from Web Data",
  author = "J.D. Velasquez and V. Palade",
  year = "2007",
  journal = "{Knowledge-Based Systems Journal}",
  number = "3",
  pages = "238--248",
  publisher = "Elsevier",
  volume = "20",
}