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On the efficiency of public, welfare and private hospitals in Germany over time : a sectoral DEA study
Helmig, Bernd, (2001)
On the Efficiency of Public, Welfare and Private Hospitals in Germany Over Time - A Sectoral DEA-Study
Helmig, Bernd, (2007)
Cost and Technical Efficiency of German Hospitals : Does Ownership Matter?
Herr, Annika, (2010)
Challenges in managing nonprofit organizations : a research overview
Helmig, Bernd, (2004)