https://www.luthandco.net/2020/03/31/notes-marginales-a-larticle-de-mimmo-peruffo-in-fomrhi-quaterly-n143-juillet-2018-theorie-et-pratique-du-commettage-des-cordages/https://www.luthandco.net/2020/04/01/some-notes-in-the-margin-about-mimmo-peruffos-paper-in-fomhri-n143-sept-2018-theory-and-practice-of-twisting-strings/