Ivanov, Svilen, Boryana Serbezova, and Yordan Nedev. “The Infrastructure-an Indicator of Sustainable Development and Consumption in Integrated Plans of Bulgarian Cities”. Balkans Journal of Emerging Trends in Social Sciences 7, no. 2 (December 30, 2024): 108–118. Accessed September 1, 2025. https://www.balkans-jetss.org/index.php/index_bjetss/article/view/128.