Ernšteins, R., Šulga, D., Štelmahere, D., & Grundšteina, S. (2007). MUNICIPAL ENVIRONMENTAL MANAGEMENT AND SUSTAINABLE DEVELOPMENT: INTEGRATION AND SYSTEMIZATION PRACTICE FOR FURTHER EDUCATION. ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference, 1, 285-294. https://doi.org/10.17770/etr2007vol1.1718