@article{Padberg:243902,
      recid = {243902},
      author = {Padberg, D.I. and Westgren, R.E.},
      title = {Direct Marketing in Perspective},
      address = {1980-12},
      number = {1632-2016-135045},
      series = {Staff Paper},
      pages = {11},
      year = {1980},
      url = {http://ageconsearch.umn.edu/record/243902},
      doi = {https://doi.org/10.22004/ag.econ.243902},
}