Let G=(V,E) be a weighted graph. The center location problem asks to find location of a facility in the graph such that the maximum weighted distance from vertices of graph to this facility is minimized. In this paper we want to find the location of airport in the Semnan province of Iran by using the algorithm of finding center of a tree. The weights of vertices are determined by Technique for Order Preference by Similarity to Ideal Solution (TOPSIS) method. The results show that ......
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