@article{Thirtle:232790,
      recid = {232790},
      author = {Thirtle, Colin},
      title = {Problems in the Definition and Measurement of Technical  Change and Productivity Growth in the U.K. Agricultural  Sector},
      address = {1986},
      number = {1657-2016-136103},
      series = {WP},
      pages = {31},
      year = {1986},
      url = {http://ageconsearch.umn.edu/record/232790},
      doi = {https://doi.org/10.22004/ag.econ.232790},
}