@article{476051,
      note = {"30th anniversary edition with a new preface by the  author."},
      author = {Posner, Richard A.},
      url = {http://library.usi.edu/record/476051},
      title = {Natural monopoly and its regulation/},
      publisher = {Cato Institute,},
      recid = {476051},
      pages = {viii, 115 p. :},
      address = {Washington, D.C. :},
      year = {1999},
}