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The hierarchical hub covering facility location problems are applied to distribution systems, transportation, waste disposal, treatment services, emergency services and remote communication. The problems attempt to determine the location of service providers' facilities at different levels and specify their linking directions in order to reduce costs and to establish an appropriate condition in distribution network. By utilizing these problems, the present paper attempts to allocatedoi:10.5829/idosi.ije.2014.27.04a.08 fatcat:sqveqrebuzdn3oczzhb2kfoipq