De Witte, Kristof and Mika, Kortelainen (2009): Blaming the exogenous environment? Conditional efficiency estimation with continuous and discrete exogenous variables. Unpublished.
De Witte, Kristof and Marques, Rui (2009): Gaming in a benchmarking environment. A non-parametric analysis of benchmarking in the water sector. Unpublished.
De Witte, Kristof and Moesen, Wim (2009): Sizing the Government. Unpublished.
