Dundurs, Jānis, and Miervaldis Lācis. “Troksnis Un vibrācija Vidē - Vides kvalitātes kritēriji”. ENVIRONMENT. TECHNOLOGY. RESOURCES. Proceedings of the International Scientific and Practical Conference 1 (June 20, 1999): 18–22. Accessed April 24, 2025. https://journals23.rta.lv/index.php/ETR/article/view/1914.