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Cost efficiency and subsidization in German local public bus transit
Nieswand, Maria; Walter, Matthias - 2013
Persistent link: https://www.econbiz.de/10009723133
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R&D efficiency and barriers to entry : a two stage semi-parametric DEA approach
Cullmann, Astrid; Schmidt-Ehmcke, Jens; Zloczysti, Petra - 2010
Persistent link: https://www.econbiz.de/10008746937
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Towards an efficient use of R&D : accounting for heterogeneity in the OECD
Cullmann, Astrid; Zloczysti, Petra - 2013
Persistent link: https://www.econbiz.de/10009723136
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The effect of restructuring electricity distribution systems on firms' persistent and transient efficiency : the case of Germany
Badunenko, Oleg; Cullmann, Astrid; Kumbhakar, Subal; … - In: The energy journal 42 (2021) 4, pp. 23-42
Persistent link: https://www.econbiz.de/10013170561
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Regulation and investment incentives in electricity distribution : an empirical assessment
Cullmann, Astrid; Nieswand, Maria - In: Energy economics 57 (2016), pp. 192-203
Persistent link: https://www.econbiz.de/10011698320
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Finding the right yardstick : regulation of electricity networks under heterogeneous environments
Bjørndal, Endre; Bjørndal, Mette; Cullmann, Astrid; … - In: European journal of operational research : EJOR 265 (2018) 2, pp. 710-722
Persistent link: https://www.econbiz.de/10011811486