https://www.ibm.com/blogs/research/2015/05/superlubricity-gets-quantified-for-the-first-time/

• https://phys.org/news/2015-05-friction-highly-pyrolytic-graphite-materials.html

https://www.ibm.com/blogs/research/2017/07/using-angles-improve-future-electronics/

• https://www.nanowerk.com/nanotechnology-news/newsid=47646.php