Dimitrova, Y. 2024. ANALYTICAL MODEL FOR DETERMINING THE FRICTION FORCE AT THE CONTACT OF A METAL BODY WITH A COPPER CONTACT SURFACE. ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference. 4, (Jun. 2024), 56–60. DOI:https://doi.org/10.17770/etr2024vol4.8197.