@article{1381526,
      recid = {1381526},
      author = {Porter, Bruce, and Lifschitz, Vladimir. and Van Harmelen,  Frank.},
      title = {Handbook of knowledge representation /},
      publisher = {Elsevier,},
      address = {Amsterdam :},
      pages = {1 online resource (xxviii, 1,005 pages ) :},
      year = {2008},
      url = {http://library.usi.edu/record/1381526},
}