Литература

https://libre.lugons.org/wp-content/uploads/casopis-pdf-hd/LiBRE-35-HD-cir.pdf

https://www.3dnatives.com/en/freecad-3d-modeling-140420205

https://sr.wikipedia.org/wiki/%D0%9A%D0%BE%D0%BC%D0%BF%D1%98%D1%83%D1%82%D0%B5%D1%80%D1%81%D0%BA%D0%B8_%D0%BF%D0%BE%D1%82%D0%BF%D0%BE%D0%BC%D0%BE%D0%B3%D0%BD%D1%83%D1%82%D0%BE_%D0%B4%D0%B8%D0%B7%D0%B0%D1%98%D0%BD%D0%B8%D1%80%D0%B0%D1%9A%D0%B5