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Mean and bold?
De Witte, Kristof, (2007)
Cost efficiency and economies of scale of Slovenian water distribution utilities : an application of panel data stochastic frontier methods
Flippini, Massimo, (2006)
Ownership, scale economies and efficiency in the Italian water sector
Di Cosmo, Valeria, (2013)
Sector fragmentation and aggregation of service provision in the water industry.
Corton, Maria Luisa, (2011)
Benchmarking Central American water utilities.
Corton, Maria Luisa, (2009)
Benchmarking Central American water utilities