@online{olson2026,
  author = {Olson, Dieter},
  title = {Contraction {Theory} {Meets} {Tangent} {Spaces:} {Stability,}
    {Optimality,} and {Scope} {Limits}},
  date = {2026-01-18},
  url = {https://affinedrift.com/articles/tangent-hyperplane-articles/Advanced/Contraction_Tangent_Unification.html},
  langid = {en}
}