@article{475149,
      author = {Burt, Ronald S.},
      url = {http://library.usi.edu/record/475149},
      title = {Structural holes: the social structure of competition /},
      publisher = {Harvard University Press,},
      recid = {475149},
      pages = {viii, 313 p. :},
      address = {Cambridge, MA :},
      year = {1992},
}