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)

The Editor-in-Chief has retracted this article. This paper was submitted to the journal Physics and Chemistry of Solid State on October 13, 2021. On November 17, 2021, the article was checked by the Unicheck system and was recommended for work with reviewers. But, the identical paper under the same title "Friction and wear of polystyrene crystal sliding against steel 100Cr6 in unlubricated contact" by the same authors was accepted in journal Tribology in Industry (http://www.tribology.rs) on September 29, 2021, and the signed Copyright Agreement. However, the authors did not report that they had previously signed a Copyright Agreement with the journal Tribology in Industry. One of the conditions of submission of a paper for publication is that authors declare explicitly that their work is original and has not appeared in a publication elsewhere. Re-use of any data should be appropriately cited. As such this article represents a severe abuse of the scientific publishing system. The scientific community takes a very strong view on this matter and apologies are offered to readers of the journal that this was not detected during the submission process.