1. https://www.911metallurgist.com/blog/ball-mill-critical-speed (last visited march, 2022)
2. Critical rotation speed for ball-milling
3. https://rius.iict.bas.bg/smart_lab.html#1 (last visited march, 2022)
4. https://www.911metallurgist.com/blog/ball-mill (last visited march, 2022)
5. https://www.tevousa.com/products/tevo-tornado-3d-printer-kit (last visited march, 2022)