Then the reference [5] has wrong formula. The right formula in the version 11:57, 6 July 2021 as it gives the right results. Please check.
Thanks for trying to improve it, but be careful because the a and b variables are redefined in the text below the formula and inconsistent with the other formula. The reference isn't wrong, just uses different variables. See my comment on the talk page https://en.wikipedia.org/wiki/Talk:Torsion_constant Xcglxdg5uj (talk) 19:09, 24 August 2021 (UTC)