Milivojević Danas, Milica, and Milena Bogdanović. “Solving the Two-Level Hierarchical Covering Location Problem With an Electromagnetism-Like Metaheuristic”. Computing and Informatics 42, no. 6 (March 21, 2024): 1471–1490. Accessed November 22, 2024. http://147.213.75.17/ojs/index.php/cai/article/view/2023_6_1471.