Matisāns, Eduards, and Semjons Ivanovs. “ENVIROMENT-FRIENDLY FARMING PROJECTS IN LATGALE”. ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference 1 (June 20, 2001): 75–80. Accessed November 21, 2024. https://journals.rta.lv/index.php/ETR/article/view/1939.