S. Aounallah, K. Loucif, and N. Khennafi-Benghalem, “Retraction Note: Friction and wear of polystyrene crystal sliding against steel 100Cr6 in unlubricated contact (PCSS: (2022), 23(2), (293-301), https://doi.org/10.15330/pcss.23.2.293-301) ”, Phys. Chem. Sol. State, vol. 23, no. 2, pp. 293–301, May 2022.