@techreport{voltpeer_study_pv_iv_2003,
  author = {Barker, G. and Norton, P.},
  title = {Building America System Performance Test Practices: Part 1 — Photovoltaic Systems},
  year = {2003},
  url = {https://docs.nlr.gov/docs/fy03osti/30301.pdf#page=20},
  institution = {National Renewable Energy Laboratory},
  number = {NREL/TP-550-30301}
}