Osis, Māris. “VAI VIDES SPECIĀLISTI SPĒJ NODROŠINĀT VIDES AIZSARDZĪBU?”. ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference 1 (June 20, 1999): 135–135. Accessed January 5, 2025. https://journals.rta.lv/index.php/ETR/article/view/1890.