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• 2017Is Contracting out of Public Services still the Great Panacea? A Systematic Review of Studies on Economic and Quality Effects from 2000 to 2014189 cited
• 2012Measuring the efficiency of water utilities: a cross-national comparison between Portugal and Italy81 cited
• 2016Assesing the Impact of Quality of Service on the Productivity of Water Industry: a Malmquist-Luenberger Approach for England and Wales51 cited
• 2014Profit, productivity and price performance changes in the water and sewerage industry: an empirical application for England and Wales49 cited
• 2018Assessing the influence of exogenous and quality of service variables on water companies´ performance using a true-fixed stochastic frontier approach46 cited
• 2012Disentangling the cost efficiency of jointly provided water and wastewater services41 cited
• 2013Are Public-Private Partnerships a Source of Greater Efficiency in Water Supply? Results of a Non-Parametric Performance Analysis Relating to the Italian Industry38 cited
• 2020Operational Efficiency of Mexican Water Utilities: Results of a Double-Bootstrap Data Envelopment Analysis38 cited
• 2011Revisiting the Portuguese experience with public- private partnerships36 cited
• 2016Price-cap regulation in the English and Welsh water industry: A proposal for measuring productivity performance32 cited
• 2018Does non-revenue water affect Malaysia's water services industry productivity?29 cited
• 2016Performance of fully private and concessionary water and sewerage companies: a metafrontier approach