BUŠMANIS, P. et al. LABAS LAUKSAIMNIECĪBAS PRAKSES (LLP) IZSTRĀDE LATVIJAI. ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference, Rezekne, Latvia, v. 1, p. 11–13, 1999. DOI: 10.17770/etr1999vol1.1916. Disponível em: https://journals23.rta.lv/index.php/ETR/article/view/1916.. Acesso em: 4 dec. 2024.