@article{150167,
      note = {Papers presented at a conference held in Lenox, Mass. in  the fall of 1981, and organized by the National Bureau of  Economic Research.},
      author = {Griliches, Zvi,},
      url = {http://library.usi.edu/record/150167},
      title = {R & D, patents, and productivity /},
      publisher = {University of Chicago Press,},
      recid = {150167},
      pages = {xi, 512 p. :},
      address = {Chicago :},
      year = {1984},
}