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APA Citation
Lauria, D. T., Maskery, B., Poulos, C., & Whittington, D. (2008). An Optimisation Model for Use of the Vi Polysaccharide Vaccine to Prevent Typhoid in Developing Countries. Manchester : Brooks World Poverty Institute, University of Manchester. http://access.bl.uk/ark:/81055/vdc_100054156311.0x000001