“ZĪDAIŅU MIRSTĪBA KĀ VIDES KVALITĀTES INDIKATORS LATGALĒ”. ENVIRONMENT. TECHNOLOGY. RESOURCES. Proceedings of the International Scientific and Practical Conference 1 (June 20, 1999): 103–109. Accessed March 11, 2026. https://archive-journals.rtu.lv/etr/article/view/3434.