@online{olson,
  author = {Olson, Dieter},
  title = {Zero-Torque {Counterfactual} {(ZTCF)} {Family}},
  date = {},
  url = {https://affinedrift.com/articles/zero-torque-counterfactual.html},
  langid = {en},
  abstract = {This article presents the full mathematical and numerical
    formulation of the Zero-Torque Counterfactual (ZTCF) family. It
    describes integration algorithms, boundary intervention conventions,
    and causal attribution limits for isolating passive momentum
    transfer from active muscle torques in the golf swing.}
}