Dundurs, Jānis, and Miervaldis Lācis. “Troksnis Un vibrācija Vidē - Vides kvalitātes kritēriji”.
ENVIRONMENT. TECHNOLOGY. RESOURCES. Proceedings of the International Scientific and Practical Conference, vol. 1, June 1999, pp. 18-22,
https://doi.org/10.17770/etr1999vol1.1914.