Salimbaeva, R., A. Adambekova, and Стамкулов S. “Integrative Justification of the Effectiveness of Environmental Protection Expenditures: The Experience of Single-Industry Towns in the Karaganda Region”. Economic series of the Bulletin of L.N. Gumilyov ENU, no. 4 (December 30, 2025): 139–156. Accessed January 28, 2026. https://bulecon.enu.kz/index.php/main/article/view/1291.