Etemad, Roghayeh, and Behrooz Alizadeh. “Some Variants of Reverse Selective Center Location Problem on Trees under the Chebyshev and Hamming Norms”. Yugoslav Journal of Operations Research 27, no. 3 (August 1, 2017): 367–384. Accessed February 1, 2026. https://yujor.erc.fon.bg.ac.rs/index.php/yujor/article/view/513.