@article{10.1109/TKDE.2012.115,
  author = {Zubiaga, Arkaitz and Fresno, Victor and Martinez, Raquel and Garcia-Plaza, Alberto P.},
  title = {Harnessing Folksonomies to Produce a Social Classification of Resources},
  journal = {IEEE Transactions on Knowledge and Data Engineering},
  publisher = {IEEE Computer Society},
  year = {2012},
  volume = {99},
  number = {PrePrints},
  doi = {http://doi.ieeecomputersociety.org/10.1109/TKDE.2012.115}
}

@misc{mejiasdeli,
  author = {Mejias, Ulises Ali},
  title = {A del.icio.us study},
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}