Khrushch, L.Z. “Application of Duality Theory to Solve Two-Criteria Problem of Linear Programming for Ecological-Economic System”. Carpathian Mathematical Publications 10, no. 2 (December 31, 2018): 324–332. Accessed November 22, 2024. https://vps.pnu.edu.ua/index.php/cmp/article/view/1492.