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Engel, E., R. Fischer and A. Galetovic, 2008. Public-private partnerships: When and how. Master Thesis, Center for Applied Economics, Universidad de Chile, Santiago, Chile.

The World Bank Group, 2016. Research and development expenditure. The World Bank Group, Washington, USA. http://data.worldbank.org/.

United Nations, 2015. Transforming our world: The 2030 agenda for sustainable development. United Nations, New York, USA.