DATA PROCESSING USING MATHEMATICAL MODELS IN LEATHER INDUSTRY . Natural Resources and Technology, [S. l.], v. 15, n. 2, p. 75–81, 2021. DOI: 10.46763/NRT21152075t. Disponível em: https://js.ugd.edu.mk/index.php/NRT/article/view/4324. Acesso em: 7 oct. 2025.