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3. The World Bank, Logistic Performance Index. http://data.worldbank.org/indicator/LP.LPI.OVRL.XQ
4. Capgemini Consulting Group: 2012 third-party logistics study the state of logistics outsourcing. http://www.3plstudy.com/media/downloads/2012/2012_3PL_Study.pdf
5. Guasch, J.L.: Logistics as a driver of competitiveness in Latin America and the Caribbean. Technical report, Inter-American Development Bank (2011)