[1]
Vilu, R. and Randla, T. 1997. SUSTAINABLE DEVELOPMENT - PROBLEMS OF MEASUREMENT AND POSSIBILITIES OF REALISATION . (CASE STUDY OF NORTH - EASTERN ESTONIA). ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference. 1, (Jun. 1997), 9–12. DOI:https://doi.org/10.17770/etr1997vol1.1863.