Conflict of interests The authors declare no financial or commercial conflict of interest. References 1, , Tribol. Int. 2016, 38, 318. 2, , Surf. Coat. Technol. 2004, 180, 76. 3, Tribol. Int. 1990, 23, 95. 4, J. Phys. D 2012, 45, 1. 5G. Stachowiak, A. W. Batchelor, Engineering tribology, 2013. 6, , J. Tribol. 1995, 117, 506. 7, , J. Tribol. 1996, 118, 484. 8, , Tribol. Trans. 1999, 42, 640. 9, Lubr. Eng. 1992, 48, 96. 10, Tribol. Trans. 2000, 43, 213. 11, , , Procedia Eng. 2016, 144, 841. 12, , , Particuology. 2016, 27, 51.