Vindele, Līga, and Veronika Buģina. “ECONOMIC ANALYSIS OF THE NATURAL RESOURCES IN THE DISTRICTS OF VIDZEME REGION”. ENVIRONMENT. TECHNOLOGY. RESOURCES. Proceedings of the International Scientific and Practical Conference 1 (June 23, 2007): 244–253. Accessed May 2, 2025. https://journals.ru.lv/index.php/ETR/article/view/1744.