Alnis, Jānis. “VIDES AIZSARDZĪBAS MĀCĪBU PRAKSES LABORATORIJA TOP ZEMNIEKU SAIMNIECĪBĀ ‘ALEKSANDRI’ (z S A)”. ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference 1 (June 20, 1999): 5–5. Accessed November 23, 2024. https://journals.ru.lv/index.php/ETR/article/view/1919.