FREIMANIS, Jānis; STONKUSS, V. USED SMEAR OILS IN LATVIA. ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference, Rezekne, Latvia, v. 1, p. 24–29, 2001. DOI: 10.17770/etr2001vol1.1927. Disponível em: https://journals23.rta.lv/index.php/ETR/article/view/1927.. Acesso em: 12 dec. 2024.