Abdullah, Tolhah, Zaitul Marlizawati Zainuddin, and Sutinah Salim. 2008. “A Simulated Annealing Approach for Uncapacitated Continuous Location-Allocation Problem With Zone-Dependent Fixed Cost”. MATEMATIKA 24 (June):67-73. https://doi.org/10.11113/matematika.v24.n.223.