Šķēle, A., Dubrovskis, V., Upītis, A., Kārkliņš, A., Kristapsons, M., & Ziemelis, I. (2001). BIOFUEL FOR NATURE PROTECTION. ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference, 1, 186-190. https://doi.org/10.17770/etr2001vol1.1957