@article{Wiggins:163403,
      recid = {163403},
      author = {Wiggins, Vince},
      title = {Stata tip 93: Handling multiple y axes on twoway graphs},
      journal = {Stata Journal},
      address = {2010},
      number = {199-2016-2709},
      pages = {2},
      year = {2010},
      url = {http://ageconsearch.umn.edu/record/163403},
      doi = {https://doi.org/10.22004/ag.econ.163403},
}