ŠĶĒLE, Arnolds; DUBROVSKIS, Vilis; UPĪTIS, Andris; KĀRKLIŅŠ, Andis; KRISTAPSONS, Miervaldis; ZIEMELIS, Imants. BIOFUEL FOR NATURE PROTECTION. ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference, Rezekne, Latvia, v. 1, p. 186–190, 2001. DOI: 10.17770/etr2001vol1.1957. Disponível em: https://journals.ru.lv/index.php/ETR/article/view/1957.. Acesso em: 4 may. 2024.