@article{Chavas:200535,
      recid = {200535},
      author = {Chavas, Jean-Paul and Cox, Thomas L.},
      title = {A Nonparametric Analysis of the Influence of Research on  Agricultural Productivity},
      address = {1991-03},
      number = {1800-2016-142348},
      series = {326},
      pages = {25},
      year = {1991},
      url = {http://ageconsearch.umn.edu/record/200535},
      doi = {https://doi.org/10.22004/ag.econ.200535},
}