@Article{crestani1997spreading,
  author = {Crestani, F.},
  title  = {Application of Spreading Activation Techniques in Information Retrieval},
  journal = {Artificial Intelligence Review},
  year   = {1997},
  number = {6},
  url    = {http://dx.doi.org/10.1023/A:1006569829653},

  const  = {\ text}
}
@Inproceedings{salton1988spreading,
  author = {Salton, G. and Buckley, C.},
  title  = {On the use of spreading activation methods in automatic information},

  year   = {1988},
  number = {},
  url    = {http://portal.acm.org/citation.cfm?id=62447&dl=ACM&coll=GUIDE},
  doi = {http://doi.acm.org/10.1145/62437.62447},
  const  = {\ text}
}