Assenova, Mariana, Zdravko Georgiev, and Branko Dunjic. “Application of Resource Efficient and Cleaner Production Approach in the Accommodation Sector of the Balkan Region”. European Journal of Sustainable Development 5, no. 4 (October 1, 2016): 431. Accessed November 22, 2024. https://ojs.ecsdev.org/index.php/ejsd/article/view/420.