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The effect of access to improved water sources and sanitation on economic efficiency : the case of sub-Saharan African countries
Halkos, George E., (2012)
Efficiency Effects of 'Privatization' in Argentina's Water and Sanitation Services
Estache, Antonio, (2015)
A privatização no setor de saneamento tem melhorado a performance dos serviços?
Faria, Ricardo de Coelho, (2007)
Efficiency in the Brazilian sanitation sector
Sabbioni, Guillermo, (2008)