An Improved Approximation Algorithm for the Metric Uncapacitated Facility Location Problem
Proceedings of the 9th International IPCO Conference on Integer Programming and Combinatorial Optimization
Inapproximability of the multi-level uncapacitated facility location problem
Proceedings of the twenty-third annual ACM-SIAM symposium on Discrete Algorithms
One-way and round-trip center location problems
Discrete Optimization
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