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Are outsourcing and non-aeronautical revenues important drivers in the efficiency of Spanish airports?
Tovar, Beatriz, (2009)
Impacto del sector privado en la eficiencia de los aeropuertos españoles
Martín-Cejas, Roberto Rendeiro, (2008)
Technical efficiency and productivity changes in Spanish airports: A parametric distance functions approach
Tovar, Beatriz, (2010)