@article {AgraliEtAl2012, title = {A Facility Location Model with Safety Stock Costs: Analysis of the Cost of Single-Sourcing Requirements}, journal = {Journal of Global Optimization}, volume = {54(3)}, year = {2012}, pages = {551-581}, doi = {http://dx.doi.org/10.1007/s10898-011-9777-z}, author = {Semra A{\u g}ral{\i} and Joseph Geunes and Z C Ta{\c s}k{\i}n} }