2020 https://www.tandfonline.com/doi/pdf/10.1080/00131857.2020.1835646?casa_token=L-3GYvHVQAAAAAAA:fsvEs0ZfjMuQh3AU4WBeUuIRcopauIsnptfz6ohpz3klGF0QT0S2n-yigNTEFLrx5Sh_q2ko6IFQlbw Academic paper