Assessing and Explaining the Relative Efficiency of Local Government
António Afonso, Sónia Fernandes
Journal Of Socio Economics, vol. 37, 2008, p. 1946-1979.

Measuring Local Government Spending Efficiency: Evidence for the Lisbon Region
António Afonso, Sónia Fernandes
Regional Studies, vol. 40, 2006, p. 39-53.